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Goodyear EfficientGrip Performance 2 vs Michelin Primacy 4 Plus

This head-to-head pits two flagship premium-touring summer tyres aimed at everyday comfort and safety: Goodyear's EfficientGrip Performance 2 and Michelin's Primacy 4 Plus. Across seven shared professional tests from 2023-2024, both deliver balanced road manners, but they take different routes to the same brief.

Michelin consistently edges objective safety metrics-especially in wet braking and aquaplaning-translating into more top placements overall. Goodyear counters with standout efficiency, value and longevity, frequently topping wear, rolling resistance and price-based metrics while remaining composed in handling. Drivers choosing between them are essentially prioritizing either maximum wet-braking confidence (Michelin) or long-term cost-efficiency and comfort (Goodyear).
EfficientGrip-Performance-2 VS Primacy-4-Plus

Test Results

Independent comparison tyre tests are the best source of data to get tyre information from, and the good news is there have been seven tests which compare both tyres directly!

Summary of seven total tests comparing both tyres directly
TyreTest WinsPerformance
Goodyear EfficientGrip Performance 2two
two wins
Michelin Primacy 4 Plusfive
five wins

While it might look like the Michelin Primacy 4 Plus is better than the Goodyear EfficientGrip Performance 2 purely based on the higher number of test wins, tyres are very complicated objects which means where one tyre is better than the other can be more important in real world use.

Let's look at how the two tyres compare across multiple tyre test categories.

Key Strengths

  • Outstanding mileage and value (frequent wins in wear and price/value metrics)
  • Lowest rolling resistance across tests, aiding fuel economy
  • Quiet, comfortable ride with stable, precise handling
  • Competitive dry and wet handling, with some category wins
  • Class-leading wet braking across all shared tests
  • Strong aquaplaning resistance and balanced wet handling
  • Consistently short dry braking with secure, predictable manners
  • High overall test finishes and broad safety margin in poor weather

Dry Braking

Looking at data from seven tyre tests, the Michelin Primacy 4 Plus was better during six dry braking tests. On average the Michelin Primacy 4 Plus stopped the vehicle in 0.99% less distance than the Goodyear EfficientGrip Performance 2.

Goodyear EfficientGrip Performance 2
37.24M
Michelin Primacy 4 Plus
36.87M
Dry braking in meters, lower is better

Best In Dry Braking: Michelin Primacy 4 Plus

Goodyear EfficientGrip Performance 2
36.31M
Michelin Primacy 4 Plus
36.58M (+0.27M)
Goodyear EfficientGrip Performance 2
37.7M (+0.8M)
Michelin Primacy 4 Plus
36.9M
Goodyear EfficientGrip Performance 2
37.7M (+1M)
Michelin Primacy 4 Plus
36.7M
Goodyear EfficientGrip Performance 2
36.4M (+0.1M)
Michelin Primacy 4 Plus
36.3M
Goodyear EfficientGrip Performance 2
37.9M (+0.6M)
Michelin Primacy 4 Plus
37.3M
Goodyear EfficientGrip Performance 2
36.4M (+0.1M)
Michelin Primacy 4 Plus
36.3M
Goodyear EfficientGrip Performance 2
38.3M (+0.3M)
Michelin Primacy 4 Plus
38M

Dry Handling [s]

Looking at data from two tyre tests, the Goodyear EfficientGrip Performance 2 was better during two dry handling [s] tests. On average the Goodyear EfficientGrip Performance 2 was 1.59% faster around a lap than the Michelin Primacy 4 Plus.

Goodyear EfficientGrip Performance 2
53.78s
Michelin Primacy 4 Plus
54.65s
Dry handling time in seconds, lower is better

Best In Dry Handling [s]: Goodyear EfficientGrip Performance 2

Goodyear EfficientGrip Performance 2
51.85s
Michelin Primacy 4 Plus
52.6s (+0.75s)
Goodyear EfficientGrip Performance 2
55.7s
Michelin Primacy 4 Plus
56.7s (+1s)

Dry Handling [Km/H]

Looking at data from two tyre tests, the Michelin Primacy 4 Plus was better during one dry handling [km/h] tests. On average the Michelin Primacy 4 Plus was 0.15% faster around a lap than the Goodyear EfficientGrip Performance 2.

Goodyear EfficientGrip Performance 2
96.8Km/H
Michelin Primacy 4 Plus
96.95Km/H
Dry Handling Average Speed, higher is better

Best In Dry Handling [Km/H]: Michelin Primacy 4 Plus

Goodyear EfficientGrip Performance 2
115.2Km/H
Michelin Primacy 4 Plus
115.1Km/H (-0.1Km/H)
Goodyear EfficientGrip Performance 2
78.4Km/H (-0.4Km/H)
Michelin Primacy 4 Plus
78.8Km/H

Subj. Dry Handling

Looking at data from one tyre tests, the Goodyear EfficientGrip Performance 2 was better during one subj. dry handling tests. On average the Goodyear EfficientGrip Performance 2 scored 5.56% more points than the Michelin Primacy 4 Plus.

Goodyear EfficientGrip Performance 2
90 Points
Michelin Primacy 4 Plus
85 Points
Subjective Dry Handling Score, higher is better

Best In Subj. Dry Handling: Goodyear EfficientGrip Performance 2

Goodyear EfficientGrip Performance 2
90 Points
Michelin Primacy 4 Plus
85 Points (-5 Points)

Wet Braking

Looking at data from seven tyre tests, the Michelin Primacy 4 Plus was better during seven wet braking tests. On average the Michelin Primacy 4 Plus stopped the vehicle in 4.82% less distance than the Goodyear EfficientGrip Performance 2.

Goodyear EfficientGrip Performance 2
40.29M
Michelin Primacy 4 Plus
38.35M
Wet braking in meters, lower is better

Best In Wet Braking: Michelin Primacy 4 Plus

Goodyear EfficientGrip Performance 2
34.34M (+1.46M)
Michelin Primacy 4 Plus
32.88M
Goodyear EfficientGrip Performance 2
37.4M (+0.7M)
Michelin Primacy 4 Plus
36.7M
Goodyear EfficientGrip Performance 2
59.6M (+5M)
Michelin Primacy 4 Plus
54.6M
Goodyear EfficientGrip Performance 2
29.2M (+1.5M)
Michelin Primacy 4 Plus
27.7M
Goodyear EfficientGrip Performance 2
33.3M (+2.2M)
Michelin Primacy 4 Plus
31.1M
Goodyear EfficientGrip Performance 2
45.6M (+2.3M)
Michelin Primacy 4 Plus
43.3M
Goodyear EfficientGrip Performance 2
42.6M (+0.4M)
Michelin Primacy 4 Plus
42.2M

Wet Braking - Concrete

Looking at data from two tyre tests, the Goodyear EfficientGrip Performance 2 was better during one wet braking - concrete tests. On average the Goodyear EfficientGrip Performance 2 stopped the vehicle in 0.67% less distance than the Michelin Primacy 4 Plus.

Goodyear EfficientGrip Performance 2
37.15M
Michelin Primacy 4 Plus
37.4M
Wet braking on Concrete in meters, lower is better

Best In Wet Braking - Concrete: Goodyear EfficientGrip Performance 2

Goodyear EfficientGrip Performance 2
36M
Michelin Primacy 4 Plus
37.7M (+1.7M)
Goodyear EfficientGrip Performance 2
38.3M (+1.2M)
Michelin Primacy 4 Plus
37.1M

Wet Handling [s]

Looking at data from two tyre tests, the Goodyear EfficientGrip Performance 2 was better during two wet handling [s] tests. On average the Goodyear EfficientGrip Performance 2 was 1.05% faster around a wet lap than the Michelin Primacy 4 Plus.

Goodyear EfficientGrip Performance 2
84.76s
Michelin Primacy 4 Plus
85.66s
Wet handling time in seconds, lower is better

Best In Wet Handling [s]: Goodyear EfficientGrip Performance 2

Goodyear EfficientGrip Performance 2
84.81s
Michelin Primacy 4 Plus
85.72s (+0.91s)
Goodyear EfficientGrip Performance 2
84.7s
Michelin Primacy 4 Plus
85.6s (+0.9s)

Wet Handling [Km/H]

Looking at data from two tyre tests, the Michelin Primacy 4 Plus was better during two wet handling [km/h] tests. On average the Michelin Primacy 4 Plus was 0.56% faster around a wet lap than the Goodyear EfficientGrip Performance 2.

Goodyear EfficientGrip Performance 2
70.95Km/H
Michelin Primacy 4 Plus
71.35Km/H
Wet Handling Average Speed, higher is better

Best In Wet Handling [Km/H]: Michelin Primacy 4 Plus

Goodyear EfficientGrip Performance 2
74.2Km/H (-0.3Km/H)
Michelin Primacy 4 Plus
74.5Km/H
Goodyear EfficientGrip Performance 2
67.7Km/H (-0.5Km/H)
Michelin Primacy 4 Plus
68.2Km/H

Subj. Wet Handling

Looking at data from one tyre tests, the Goodyear EfficientGrip Performance 2 and Michelin Primacy 4 Plus performed equally well in subj. wet handling tests.

Goodyear EfficientGrip Performance 2
95 Points
Michelin Primacy 4 Plus
95 Points
Subjective Wet Handling Score, higher is better

Best In Subj. Wet Handling: Both tyres performed equally well

Goodyear EfficientGrip Performance 2
95 Points
Michelin Primacy 4 Plus
95 Points

Wet Circle

Looking at data from one tyre tests, the Michelin Primacy 4 Plus was better during one wet circle tests. On average the Michelin Primacy 4 Plus had 5.13% higher lateral wet grip than the Goodyear EfficientGrip Performance 2.

Goodyear EfficientGrip Performance 2
5.92m/s
Michelin Primacy 4 Plus
6.24m/s
Lateral wet grip in m/s squared, higher is better

Best In Wet Circle: Michelin Primacy 4 Plus

Goodyear EfficientGrip Performance 2
5.92m/s (-0.32m/s)
Michelin Primacy 4 Plus
6.24m/s

Straight Aqua

Looking at data from six tyre tests, the Michelin Primacy 4 Plus was better during six straight aqua tests. On average the Michelin Primacy 4 Plus floated at a 2.83% higher speed than the Goodyear EfficientGrip Performance 2.

Goodyear EfficientGrip Performance 2
79.78Km/H
Michelin Primacy 4 Plus
82.1Km/H
Float Speed in Km/H, higher is better

Best In Straight Aqua: Michelin Primacy 4 Plus

Goodyear EfficientGrip Performance 2
74.98Km/H (-3.2Km/H)
Michelin Primacy 4 Plus
78.18Km/H
Goodyear EfficientGrip Performance 2
80.3Km/H (-3.2Km/H)
Michelin Primacy 4 Plus
83.5Km/H
Goodyear EfficientGrip Performance 2
76Km/H (-2.1Km/H)
Michelin Primacy 4 Plus
78.1Km/H
Goodyear EfficientGrip Performance 2
74.9Km/H (-0.4Km/H)
Michelin Primacy 4 Plus
75.3Km/H
Goodyear EfficientGrip Performance 2
81Km/H (-4.2Km/H)
Michelin Primacy 4 Plus
85.2Km/H
Goodyear EfficientGrip Performance 2
91.5Km/H (-0.8Km/H)
Michelin Primacy 4 Plus
92.3Km/H

Curved Aquaplaning

Looking at data from five tyre tests, the Goodyear EfficientGrip Performance 2 was better during two curved aquaplaning tests. On average the Goodyear EfficientGrip Performance 2 slipped out at a 1.09% higher speed than the Michelin Primacy 4 Plus.

Goodyear EfficientGrip Performance 2
5.52m/sec2
Michelin Primacy 4 Plus
5.46m/sec2
Remaining lateral acceleration, higher is better

Best In Curved Aquaplaning: Goodyear EfficientGrip Performance 2

Goodyear EfficientGrip Performance 2
3.4m/sec2 (-0.02m/sec2)
Michelin Primacy 4 Plus
3.42m/sec2
Goodyear EfficientGrip Performance 2
3.5m/sec2 (-0.1m/sec2)
Michelin Primacy 4 Plus
3.6m/sec2
Goodyear EfficientGrip Performance 2
3.1m/sec2
Michelin Primacy 4 Plus
2.9m/sec2 (-0.2m/sec2)
Goodyear EfficientGrip Performance 2
4.49m/sec2 (-0.3m/sec2)
Michelin Primacy 4 Plus
4.79m/sec2
Goodyear EfficientGrip Performance 2
13.1m/sec2
Michelin Primacy 4 Plus
12.6m/sec2 (-0.5m/sec2)

Subj. Comfort

Looking at data from one tyre tests, the Goodyear EfficientGrip Performance 2 and Michelin Primacy 4 Plus performed equally well in subj. comfort tests.

Goodyear EfficientGrip Performance 2
95 Points
Michelin Primacy 4 Plus
95 Points
Subjective Comfort Score, higher is better

Best In Subj. Comfort: Both tyres performed equally well

Goodyear EfficientGrip Performance 2
95 Points
Michelin Primacy 4 Plus
95 Points

Noise

Looking at data from six tyre tests, the Goodyear EfficientGrip Performance 2 and Michelin Primacy 4 Plus performed equally well in noise tests.

Goodyear EfficientGrip Performance 2
70.05dB
Michelin Primacy 4 Plus
70.05dB
External noise in dB, lower is better

Best In Noise: Both tyres performed equally well

Goodyear EfficientGrip Performance 2
70.8dB (+0.5dB)
Michelin Primacy 4 Plus
70.3dB
Goodyear EfficientGrip Performance 2
70.6dB (+0.1dB)
Michelin Primacy 4 Plus
70.5dB
Goodyear EfficientGrip Performance 2
64dB
Michelin Primacy 4 Plus
64.3dB (+0.3dB)
Goodyear EfficientGrip Performance 2
71dB (+0.3dB)
Michelin Primacy 4 Plus
70.7dB
Goodyear EfficientGrip Performance 2
72.3dB
Michelin Primacy 4 Plus
72.7dB (+0.4dB)
Goodyear EfficientGrip Performance 2
71.6dB
Michelin Primacy 4 Plus
71.8dB (+0.2dB)

Tyre Weight

Looking at data from one tyre tests, the Goodyear EfficientGrip Performance 2 was better during one tyre weight tests. On average the Goodyear EfficientGrip Performance 2 weighed 3.49% less than the Michelin Primacy 4 Plus.

Goodyear EfficientGrip Performance 2
8.3Kg
Michelin Primacy 4 Plus
8.6Kg
Tyre Weight Per Set, lower is better

Best In Tyre Weight: Goodyear EfficientGrip Performance 2

Goodyear EfficientGrip Performance 2
8.3Kg
Michelin Primacy 4 Plus
8.6Kg (+0.3Kg)

Wear

Looking at data from three tyre tests, the Goodyear EfficientGrip Performance 2 was better during three wear tests. On average the Goodyear EfficientGrip Performance 2 is predicted to cover 10.68% miles before reaching 1.6mm than the Michelin Primacy 4 Plus.

Goodyear EfficientGrip Performance 2
59916.67KM
Michelin Primacy 4 Plus
53516.67KM
Predicted tread life in KM, higher is better

Best In Wear: Goodyear EfficientGrip Performance 2

Goodyear EfficientGrip Performance 2
65700KM
Michelin Primacy 4 Plus
61300KM (-4400KM)
Goodyear EfficientGrip Performance 2
68800KM
Michelin Primacy 4 Plus
60300KM (-8500KM)
Goodyear EfficientGrip Performance 2
45250KM
Michelin Primacy 4 Plus
38950KM (-6300KM)

Value

Looking at data from one tyre tests, the Goodyear EfficientGrip Performance 2 was better during one value tests. On average the Goodyear EfficientGrip Performance 2 has a 19.54% better value based on dollars per 1000 warranted miles than the Michelin Primacy 4 Plus.

Goodyear EfficientGrip Performance 2
2.43Price/1000
Michelin Primacy 4 Plus
3.02Price/1000
Dollars/1000 miles based on mileage warranty, lower is better

Best In Value: Goodyear EfficientGrip Performance 2

Goodyear EfficientGrip Performance 2
2.43Price/1000
Michelin Primacy 4 Plus
3.02Price/1000 (+0.59Price/1000)

Price

Looking at data from five tyre tests, the Michelin Primacy 4 Plus was better during two price tests. On average the Michelin Primacy 4 Plus cost 2.1% less than the Goodyear EfficientGrip Performance 2.

Goodyear EfficientGrip Performance 2
1549.68
Michelin Primacy 4 Plus
1517.18
Price in local currency, lower is better

Best In Price: Michelin Primacy 4 Plus

Goodyear EfficientGrip Performance 2
96.39 (+2.5)
Michelin Primacy 4 Plus
93.89
Goodyear EfficientGrip Performance 2
110
Michelin Primacy 4 Plus
120 (+10)
Goodyear EfficientGrip Performance 2
7000 (+250)
Michelin Primacy 4 Plus
6750
Goodyear EfficientGrip Performance 2
167
Michelin Primacy 4 Plus
182 (+15)
Goodyear EfficientGrip Performance 2
375
Michelin Primacy 4 Plus
440 (+65)

Rolling Resistance

Looking at data from four tyre tests, the Goodyear EfficientGrip Performance 2 was better during four rolling resistance tests. On average the Goodyear EfficientGrip Performance 2 had a 5.31% lower rolling resistance than the Michelin Primacy 4 Plus.

Goodyear EfficientGrip Performance 2
6.06kg / t
Michelin Primacy 4 Plus
6.4kg / t
Rolling resistance in kg t, lower is better

Best In Rolling Resistance: Goodyear EfficientGrip Performance 2

Goodyear EfficientGrip Performance 2
7.52kg / t
Michelin Primacy 4 Plus
8.24kg / t (+0.72kg / t)
Goodyear EfficientGrip Performance 2
0.775kg / t
Michelin Primacy 4 Plus
0.797kg / t (+0.02kg / t)
Goodyear EfficientGrip Performance 2
7.62kg / t
Michelin Primacy 4 Plus
8.16kg / t (+0.54kg / t)
Goodyear EfficientGrip Performance 2
8.34kg / t
Michelin Primacy 4 Plus
8.42kg / t (+0.08kg / t)

Fuel Consumption

Looking at data from two tyre tests, the Goodyear EfficientGrip Performance 2 was better during one fuel consumption tests. On average the Goodyear EfficientGrip Performance 2 used 0.86% less fuel than the Michelin Primacy 4 Plus.

Goodyear EfficientGrip Performance 2
5.75l/100km
Michelin Primacy 4 Plus
5.8l/100km
Fuel consumption in Litres per 100 km, lower is better

Best In Fuel Consumption: Goodyear EfficientGrip Performance 2

Goodyear EfficientGrip Performance 2
5.7l/100km
Michelin Primacy 4 Plus
5.8l/100km (+0.1l/100km)
Goodyear EfficientGrip Performance 2
5.8l/100km
Michelin Primacy 4 Plus
5.8l/100km

Abrasion

Looking at data from two tyre tests, the Michelin Primacy 4 Plus was better during two abrasion tests. On average the Michelin Primacy 4 Plus emitted 10.07% less particle wear matter than the Goodyear EfficientGrip Performance 2.

Goodyear EfficientGrip Performance 2
56.6mg/km/t
Michelin Primacy 4 Plus
50.9mg/km/t
Weight of Tyre Wear Particles Lost (mg/km/t), lower is better

Best In Abrasion: Michelin Primacy 4 Plus

Goodyear EfficientGrip Performance 2
61.3mg/km/t (+7.6mg/km/t)
Michelin Primacy 4 Plus
53.7mg/km/t
Goodyear EfficientGrip Performance 2
51.9mg/km/t (+3.8mg/km/t)
Michelin Primacy 4 Plus
48.1mg/km/t

Real World Driver Reviews

Goodyear EfficientGrip Performance 2 Driver Reviews

Across 101 reviews, the Goodyear EfficientGrip Performance 2 is most often praised as a premium touring tyre with outstanding longevity, strong day-to-day grip (dry and frequently wet), and a noticeably quiet, comfortable ride with good fuel economy. Many drivers report very high mileages with slow, even wear and stable motorway manners, making it especially popular for high-mileage commuting and taxi/fleet use. A smaller but recurring set of complaints centers on a soft sidewall feel (vague/"spongy" steering, tramlining or less confidence when pushed) and, for some users, increased or unusually high road noise as the tyre ages; a minority also note weaker wet braking/traction than expected.

Based on 112 reviews with an average rating of 85%

Michelin Primacy 4 Plus Driver Reviews

Most drivers rate the Michelin Primacy 4 Plus highly for quiet, comfortable touring manners with strong wet and dry grip and confident braking, often noting improved stability versus previous tyres. High-scoring reviews frequently praise low noise, comfort, and good wear. A minority report issues: noticeable road noise on rough surfaces, weaker steering precision versus sport tyres, and occasional wet/cold grip criticism. Overall, the Primacy 4 Plus is a well-liked premium touring tyre with comfort and wet safety as standouts.

Based on 34 reviews with an average rating of 80%

Best Review for the Goodyear EfficientGrip Performance 2
Given 100% 205/55 R16 V on mostly motorways for 1,000 easy going miles
Been looking for new set of summer tyres after decided to change my wheels size too, I went from 17” wheels down to 16” and fitted new set of Goodyear efficient grip performance 2, latest model tyres, they were made in week 7 of 2020 and I fitted them in week 8 of 2020, absolutely brand new and fresh rubber. So far so good, traveled around 1000 miles and tyres are excellent, performance, comfort, even though they are smaller size there is no negative performance, corners great, braking in both dry and wet is good, car feels very positive to drive , noise level also good. This is the first... Continue reading this review using the link below
Helpful 1450 - tyre reviewed on March 8, 2020
View all Goodyear EfficientGrip Performance 2 driver reviews >>
Best Review for the Michelin Primacy 4 Plus
Given 97% 235/45 R17 on a combination of roads for 1,000 average miles
Coming from the Civics original tyres Primacy 3 that’s lasted 25Kmls or just over 4 years, I don’t do a lot of miles daily but those Primacy 3 tyres served me well with just the road noise being a little loud at times I liked the dry, wet, handling and comfort of these Michelin’s.

So with not a lot of info on the new Primacy 4Plus and needing 4tyres I decided to go with these anyway as only £1.oo each dearer than the primacy 4 when I purchased, in for a penny in for a pound, these are the XL reinforced version I went for as they are a whole 1DB quieter than the non XL... Continue reading this review using the link below
Helpful 1504 - tyre reviewed on July 24, 2022
View all Michelin Primacy 4 Plus driver reviews >>

Conclusion

Across the test set, Michelin Primacy 4 Plus proves the safer bet in adverse weather: it wins all seven wet-braking comparisons, often by meaningful margins (circa 4-8%), and shows stronger aquaplaning resistance. That consistent wet advantage, plus slightly shorter dry stops in most tests, explains its five overall test wins.

Goodyear EfficientGrip Performance 2 excels on total ownership: lower rolling resistance, lower purchase price in most sizes tested, and materially higher predicted mileage (often 7-16%+), delivering leading value scores. It also runs quietly and handles with precision, occasionally beating Michelin on dry and subjective handling. If you drive mostly in mixed urban/highway conditions and value long life and economy, Goodyear is compelling. If you regularly face heavy rain or want the shortest possible stops, Michelin is the confident, safety-first choice. The practical takeaway: Michelin for maximum wet safety, Goodyear for the best long-term value without major compromises.
Key Differences
  • Wet braking: Michelin wins 7/7, often by 4-8%, a meaningful real-world safety gap
  • Aquaplaning: Michelin stronger in straight and curved tests overall; Goodyear occasionally edges curved
  • Dry dynamics: Goodyear often sharper in handling; dry braking edge typically goes to Michelin by small margins
  • Efficiency: Goodyear leads rolling resistance in all shared measures, aiding fuel consumption
  • Longevity and cost: Goodyear shows higher projected mileage and lower price, delivering better value scores
  • Noise/comfort: Both are quiet and comfortable; Goodyear marginally quieter in several tests
Goodyear EfficientGrip Performance 2

Overall Winner: Goodyear EfficientGrip Performance 2

Based on the tyre test data and user reviews we have in our database, the Goodyear EfficientGrip Performance 2 has demonstrated better overall performance in this comparison. However, as you can see from the spider diagram above, each tyre has its own strengths which should be considered in your final tyre buying choice.

Similar Comparisons

Looking for more tyre comparisons? Here are other direct comparisons involving these tyres:

Goodyear EfficientGrip Performance 2 Top Comparisons

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Michelin Primacy 4 Plus Top Comparisons

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Footnote

This page has been developed using tyre industry testing best practices. This means we are only comparing tests which have had both tyres in the same test.

Why is this important? Tyre testing is heavily affected by things like surface grip levels and surface temperature, which means you can only compare values from the same day. During a tyre test external condition changes are calculated into the overall results, but it is not possible to calculate this between tyre tests performed on different days or at different locations.

As a result you will see other tests on Tyre Reviews which feature both the %s and %s, but as they weren't conducted on the same day, the results are not comparable.

Lots of other websites do this sort of tyre comparison, Tyre Reviews doesn't.