why does increasing the tires size on a truck, say F250 4x4 crew gasoline engine, drastically reduce gas mileage?. I could understand some but I read of some going from 18 to 13 but that might have been a diesel.
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Originally posted by Kmiles84 View PostLess revolutions in a mile. When your going 65 according to your truck but your really going 68-69.
like Dale and Shiner said above...
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There's more factors.
I had a 2002 F350 diesel that got 18mpg with 12" of lift, 38" tires, and a programmer. There was plenty of motor, in that truck, for all that.
On the other hand, if you put 35s on an Ecoboost, it's going to suffer. That motor is really designed to pull the truck just as it comes off the assembly line.
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