what is the formula for getting the actual mileage with my size tires, 295/70/17?

say I got 350 miles to the tank without a correction......what would my actual mileage be?

I believe I am putting more miles on the truck than it actually is showing but I dont know how much more. If someone could help me out that would be great. thanx

 

5.2% correction 70 mph = 73.64 corrected. 350 miles = 368.2 traveled.

Tire calculator

 

Another greaat site here....
http://www.sjdsm.com/tech/tire_size.htm

RJ

 

thanks alot guys......I actually thought it would be a little more than that, but then again what do I know

 

Kind of a dumb question here, but what is the stock tire size for our trucks?

 

It is 265/70/17

 

"say I got 350 miles to the tank without a correction......what would my actual mileage be?"




You can't correct your fuel mpg just with a percentage of tire sizes. Correct the odometer then calculate the fuel mileage from actual miles traveled and fuel used.

You can only correct the speedometer error with the percentage difference.

John

 

it should be aboout .5 mpg improvement when adjusted

 

Pay the dealer about 70$ to set the pinion factor, or get something like a BullyDog that allows you set it as well.
Places like tirerack.com list the pinon factor for the brand/size tires you have.

 

http://www.f-body.org/gears/

I like this one

Lets you plug in gear ratios for each gear and holds them on the screen to compare

 

Just in case you don't have the calculator on the PC handy, it's width (295) divided by 25.4 (conversion factor to inches), multiplied by the aspect ratio percentage (.70), multiplied by 2 (2 sidewalls), plus the rim height (17)=33.26 inches. Width of the tread is 11.61 inches. Of course actual sizes may vary a little due to mfg's actual specs.

 

That's why I used the "revs per mile" figure for the tire. Each manufacturer tests this for the actual tire, not just what it's supposed to be nominally.