Puma Fuel economy on larger tyres

Mine got 505 when the light came on,I do give it the beans though. Pat

Which tyres Pat? i give mine a pretty hard time, i was happy with the last tank considering the beach driving, though i figured i would get a pretty constant 6-650 out of a tank, i guess maybe after a retune and EGR disable it might improve.

oh and looking back at the figures stated, these are real figures from the ODO, not adjusted to take tyres in to account, so inface i am probobly getting the same or better KM per L as i was with the 7.50x16s

I am at the moment attempting to get the worst urban consumption from mine with 255's. I am only doing around 10 km per day 5th gear rarely so will be interesting. Showing 150 km on the first quater tank but we will see. I'll fill it next week and see.

Allan

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Originally Posted by cal415

Which tyres Pat? i give mine a pretty hard time, i was happy with the last tank considering the beach driving, though i figured i would get a pretty constant 6-650 out of a tank, i guess maybe after a retune and EGR disable it might improve.

oh and looking back at the figures stated, these are real figures from the ODO, not adjusted to take tyres in to account, so inface i am probobly getting the same or better KM per L as i was with the 7.50x16s

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235/85.I don't believe in the drive easy last longer stuff,warm her up and get going and keep the combustion temps up. Pat

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Originally Posted by Allan

I am at the moment attempting to get the worst urban consumption from mine with 255's. I am only doing around 10 km per day 5th gear rarely so will be interesting. Showing 150 km on the first quater tank but we will see. I'll fill it next week and see.

Allan

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With mine it seems the first 2/3 on the gauge goes fast and the last bit lasts for a few hundred KM

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Originally Posted by cal415

With mine it seems the first 2/3 on the gauge goes fast and the last bit lasts for a few hundred KM

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Mine is the reverse on both vehicles, I can do 100km and the guage not move, then its away after half gonewithin a 100km or so find a B.P. You dont have long to go befoe Bing:(:(

Allan

Yes i get 100-150 before the needle moves too, then it drops till about a 1/3 of a tank within 200km then the last 200-250 from the last 1/3.

mine doesn't really seem to change whether i run the 235 GG stocks or the 255 Km2's - normally about 600km for 62l

I put this down to the defa being as aerodyanic as a fridge so tyres are the least of the problem

when i tow the Jayco (sitting on 100km/h) i get about 12.5l/100km

i think that the tread pattern and type can make a difference. A soft muddie will prob have more friction than a AT or hwy tyre but still depends on the diameter % increase.

255 or 285 are not that big a difference from stock on a defa. if you go up a lot in diameter you will see differences.