FL2 with new tyres then MPG goes thru the floor

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bighammer

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About 6 weeks ago I had all 4 tyres replaced with shiny new General Grabber UHPs. The old tyres, a mix of worn and very worn Michelins / Kyhos, had just about had it.

With the old tyres on I was getting 34 to 36 mpg, with the new rubber it's dropped to between 30 and 34 (34 is a struggle). All the pressures seem correct.

Any ideas? Do different tyres need different pressures in there?

TIA......
 
If your tyres were very worn down you can easily have a diference of around 2% in the overall rolling radius compared to new, which would - in my understanding anyway - easily give a falsely high MPG figure; the odometer thinking it's gone further than it really has.

Larger rolling radius = less rotations for the same distance covered. Therefore smaller rolling radius (worn out tyre) will rotate more times to cover a mile meaning the odometer thinks it's gone further because it measures by revolutions at the hub

I think anyway.....
 
Didn't notice any difference when i fitted Grabber UHPs.......
What pressure do you have in them? you could always try an extra couple of psi....
 
tyre size - 235/65 R 17 and I normally keep them at 32 psi.

If the "real" mpg is 30mpg - that's pretty bad (IMO) What are other FL2 drivers getting?
 
Last edited:
I didnt bother looking to compare the actual treads on the tyre.

Are your new tyres more aggressive in terms of tread pattern? Since a more aggressive tread will give higher roll resistance and therefore affect negatively on your mpg.

Standard fit tyres are normally those with the lowest roll resistance, so the company can give out higher mpg statistics with the vehicle. Its why even on 4x4 vehicles you find from new, they come with low profile, thin sidewalled, shallow treaded, conservative tread patterns. Definately not designed for offroading.
 
Vissie said:
I didnt bother looking to compare the actual treads on the tyre.

Are your new tyres more aggressive in terms of tread pattern? Since a more aggressive tread will give higher roll resistance and therefore affect negatively on your mpg.

Standard fit tyres are normally those with the lowest roll resistance, so the company can give out higher mpg statistics with the vehicle. Its why even on 4x4 vehicles you find from new, they come with low profile, thin sidewalled, shallow treaded, conservative tread patterns. Definately not designed for offroading.
Click to expand...

They're not toblerone knobbly. When going through the tyre choices, ratings for the General Grabber UHPs included comments about their quietness on the road. Quiet = lower rolling resistance possibly?
 
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