How much do large tires affect your gas mileage?

I am looking to buy at least 32 inch (outer diameter) tires and want to know how much it affects gas mileage. Also, what is good company that sells large tires for a responsible price?|||technically, with bigger wheels (rims and tyres combined) for every revolution of the wheel you actually travel a further distance. This means that for the same amount of effort by the engine you get more distance, so your mileage should improve. Realistically, there are so many other variables that you probably will not notice any difference whatsoever. Check out tire rack - http://www.tirerack.com/|||tirerack.com for a wide choice of 18 different tire brands and sizes.





Read the specifications pages on the tires you're looking at. Any larger tire that rolls 20 less revolutions per mile makes the speedometer read 1-2 miles slow. Larger diameter tires kill low end torque and horsepower with a small weak motor. They'll also hurt fuel economy unless you live where all the highways are flat and you do mostly long trips.|||Depending on the size of the tire it not only uses more gas but it can also change the way your speedometer reads. With the larger diameter tire it take the wheel longer to turn one turn. That means that you go farther for the same turn of the wheel. Your speed will read 70mph but the police will say you were doing 75mph. In turn this can use more gas. Also if you buy a tire with larger tread or nobbie 4x4 tires, this can produce more drag as the tire hits the road. This is why race cars use smooth tires. Smooth tires = less friction = but less grip. Big nobbie tires = more drag = more grip = more gas needed.|||As you know, there's no such thing as a free lunch.


The larger tire diameter effect is similar to changing the gear ratio in your differential somewhat - this may increase your high way mileage a bit but it will be at the cost of somewhat poorer fuel economy in the city. Overall, I suspect the change will be minimal.|||It is about 3-8 miles per gallon loss. As for getting reasonable price on the tires, I think your local Wal-mart have great price. You should shop around also.|||might lose up to half really and any tire store can get yuo a price on pretty much any tire but can try tirerack.com