Fuel consumption on larger tyres

[Cruisemaster Lurker Find all posts View Profile Close Cruisemaster]

Hello all

I was wondering what changes in fuel consumption people have seen when changing to larger dia tyres.

Additionally have you noticed a reduction in driving performance? eg. Sluggish from the lights or poor engine braking when in low range

thanks

[AussieAndy Find all posts View Profile Close AussieAndy]

Sorry, I can't really help, we did 200Km before ditching the stock tyres

[Guest Close Guest]

I have 2 sets and change them when on trips.
265/65R17 Grandtrek AT20s
265/70R17 Goodyear Wrangler MT/R

There is noticeable difference between the 2 in terms of acceleration and braking. Consumption also goes up approximately 1l/100km. Most of the good 4WD tyres are in the 70 profile. You will just need to check if they are legal and whether your insurance company will cover you.

[juc33_prado Advanced Member Find all posts View Profile Close juc33_prado]

This is not a great comparison, but it may be insightful.

I have a 90 series 2.7L 4cyl and for urban/highway mix driving was getting approx 12.7L/100km on 225/75R16 29" Cooper AT3's AT and after changing to 235/85R16 32" Cooper STMaxx MT (approx 8% size increase), I now get approx 14.7L/100km (approx 14% increase)

And yes a little bit more sluggish off the lights however, much better off-road on trails, which is what I use mine for, (not a daily drive).

SAM

[kav Avid PP Poster! Find all posts View Profile Close kav]

If you increase your tire size you will need to use a larger throttle position to make the car do what it needs to do. I noticed a big difference when I just went to new AT'S at the same size .

[Cruisemaster Lurker Find all posts View Profile Close Cruisemaster]

Thanks for the replies,

Kav. What size did you go to and what increase did you see?

[BiLLz0r Advanced Member Find all posts View Profile Close BiLLz0r]

Our consumption increased about 1.5l/100 with 70 series MT STZ's from the crappy grandtreks in 65 profile. A little slower acceleration but ours is V6 so kicks butt anyway ��

[kav Avid PP Poster! Find all posts View Profile Close kav]

When I went from the worn out grand treks to new ATs there was a significant drop in my fuel range and throttle response and that was just with the same standard size tires on the v6.

[Cruisemaster Lurker Find all posts View Profile Close Cruisemaster]

Thanks again,

Any results from diesel vehicles?

[Tin175 Senior Member Find all posts View Profile Close Tin175]

Thanks again,

Any results from diesel vehicles?

I have a 150 GXL Diesel.

I went from 265/65/17 to 265/70/17
My consumption went up from an average of 10.6 to 11.8

I also have a 2" lift and roof racks. My speedo now also matches up perfectly with the GPS

[derek11 Advanced Member Find all posts View Profile Close derek11]

Thanks again,

Any results from diesel vehicles?

I went up to 285/70/17 (33") so fuel consumption went up from approx. 11.0 to approx. 13.0
I have a throttle booster fitted so its not sluggish of the mark and the scan gauge has been set for the larger tyres to get the correct speedo speed.