I can't seem to figure out the math...

[nuthinbutfords]

Okay y'all I am plain dumb I guess. I use an app on my phone that is like the fuely app. I just filled up tonight and the app said I got 14.5mpg. Now I know its not right due to me having larger tires. So I am asking how to calculate it right. Truck came with 265/75-16 tires. Currently has 37/13.50-17 tires. According to a converter it shows that the tire I have now is 59.2% larger. Seems a little large. But If you all could help me please I would be appreciative of it.

[fdchief]

Tire size calculator

[fdchief]

that way you can put in stock then your current tires... i used this one before

[Turbostang500]

A 265/75r16 tire should be about 31.5" tall

So 37÷31.5=1.17 or 17%.

Your new tires are 17% taller than your old tires.
Multiply your mileage by 1.17 and that should be the corrected mileage.

[carolinaboy02powerstroke]

Originally Posted by nuthinbutfords

Okay y'all I am plain dumb I guess. I use an app on my phone that is like the fuely app. I just filled up tonight and the app said I got 14.5mpg. Now I know its not right due to me having larger tires. So I am asking how to calculate it right. Truck came with 265/75-16 tires. Currently has 37/13.50-17 tires. According to a converter it shows that the tire I have now is 59.2% larger. Seems a little large. But If you all could help me please I would be appreciative of it.

If you can find someone with an Autoenginuity scan tool, you can set your vehicle to the tire size that you have on the vehicle vs. stock.