Dunlop Grandtrek AT20 vs AT25 - Which To Buy? [Test Data]

Fuel Efficiency

The US Department of Energy estimates that around 25% of the fuel consumption of a vehicle is attributable to the tyres. That's a lot, and it means that choosing fuel efficient tyres can save you quite a bit of money.

The Grandtrek AT20 tyres rank a C on a scale of A to E in the official fuel efficiency tests carried out by the EU (they call these rolling resistance tests).

The Grandtrek AT25 tyres also get a grade of C.

As their fuel efficiency grade is the same, expect negligible differences in fuel consumption between them.

Here's a graph comparing the Grandtrek AT20 and Grandtrek AT25 tyres for fuel efficiency (1 = Grade E, 5 = Grade A).

Grip & Handling

We'll now take a look at how these tyres compare in terms of grip and handling.

A good measure of this is 'wet grip', which is an indication of how well the tyres will allow the vehicle to come to a stop in wet conditions.

The Grandtrek AT20 tyres rank a D on a scale of A to E in the official fuel tests carried out by the EU.

The Grandtrek AT25 tyres, on the other hand, get a grade of D.

As their wet grip grade is the same, expect negligible differences in terms of braking distance.

Here's a graph comparing the Grandtrek AT20 and Grandtrek AT25 tyres for wet grip (1 = Grade E, 5 = Grade A).

Noise

Another key factor to consider when choosing a tyre is road noise. Once you're over about 40 km/h, the dominant source of noise you hear is from the contact of your tyres on the road.

There is a surprisingly wide variation in the amount of noise each tyre makes.

The Grandtrek AT20 tyres produce 71.3 dB of road noise, which corresponds to a rank of B on a scale of A to C in the standardised testing done by the EU.

On the other hand, the Grandtrek AT25 tyres produce 71.3 dB of road noise, which means a grade of B.

As their noise grade is the same, don't expect many differences in terms of cabin noise.

Here's a visual representation of how the Grandtrek AT20 and Grandtrek AT25 tyres stack up for noise (1 = Grade C, 3 = Grade A).

Based on the results of a number of tyre benchmarks, the Grandtrek AT20 scores 4 out of 5 for comfort. We don't have any comfort data for the Grandtrek AT25 tyres.

The Grandtrek AT20 tyres have a treadwear rating of 300, which means that they would last 3 times longer than a tyre with a rating of 100. There's no treadwear data available for the Grandtrek AT25 tyres.

The Grandtrek AT20 tyres have a traction grade of B (on a scale of AA, A, B, C). There's no UTQG traction grading data available for the Grandtrek AT25 tyres.

The Grandtrek AT20 tyres have a temperature resistance grade of B (on a scale of A, B, C). There's no UTQG temperature resistance grading data available for the Grandtrek AT25 tyres.

For fuel efficiency, Grandtrek AT20 score a grade of C, which is more or less average. Grandtrek AT25 end up with a grade of C, which is more or less average.

More important is the wet grip, which gives you an indication of their traction and handling. In this regard, both the Grandtrek AT20 and the Grandtrek AT25 get a score of D, which is below average.

More important is the wet grip, which gives you an indication of their traction and handling. In this regard, Grandtrek AT20 get a score of B, which is about typical. Grandtrek AT25 end up with a grade of B, which is about typical.