Thread: Puma Fuel economy on larger tyres

The width is what would make the difference with those sizes Mick, a 255 will drive much nicer. You've got them there try them both and see.
You still gotta bring it in for me to have a look at.

The bigger tyres leads to increased consumption is a myth.

Remember, when you change the tyre size, your odometer reading also goes off. So now you are calculating consumption based on an inaccurate reading of the mileage

The fuel usage on my Puma with an Alive remap is the same no matter what set of tyres I put on. Today I am running Mickey Thomson 305/70x16 Baja ATZ on alloys with a built in 30mm offset. In the summer I use the standard boosts with 235/85x16 and for mud plugging I use 265/75x16 BFG MT on modulars. The speedo is also accurate with the 305's compared to the 235's which put it out by a couple of mph on the slow side. I have found that the wider the tyre the better the ride even in deep snow where normally a thinner tyre would be best as it cuts through and offers less resistance. Here is a link to a tyre calculator which gives a good visual indication to different tyre sizes:

Tire size calculator

Originally Posted by Lorryman100

The fuel usage on my Puma with an Alive remap is the same no matter what set of tyres I put on. Today I am running Mickey Thomson 305/70x16 Baja ATZ on alloys with a built in 30mm offset. In the summer I use the standard boosts with 235/85x16 and for mud plugging I use 265/75x16 BFG MT on modulars. The speedo is also accurate with the 305's compared to the 235's which put it out by a couple of mph on the slow side. I have found that the wider the tyre the better the ride even in deep snow where normally a thinner tyre would be best as it cuts through and offers less resistance. Here is a link to a tyre calculator which gives a good visual indication to different tyre sizes:

Tire size calculator

Excellent little tyre calculator Lorryman. Thanks for that. I’ve been using an old and tattered tyre spec leaflet I’ve had for around 20 years. This one is a really little rip snorter.
Cheers

well just filled up tonight, worst tank yet, 600km on the dot with 68l fill.

I will be putting the tyres on sometime this week, running the 255s i guess i will see how it goes.

600,whats wrong with mine then. Pat

driving style maybe? heavy right foot? i guess i have given it a bit more right foot this tank, driving has been a mix of city driving and drive to work in stop start traffic but in 80-90k zones all the way.

well for the 285's vs 255s vs 7.50x16s, so far i am noticing little difference, last 2 tanks first one on 255s i got 540km before the light came on filled up shortly after at 62L then next time on 285s 570km before the light came on filled up at just under 600km with 63L, all very similar driving, city and highway combined.