2nd Gen Non-Engine/Transmission Help on the Tire/mileage question

[radar doctor]

I have a 99 which had 245/16 tires and the speedometer was right on target. Now i have changed to 235/85 / R16 which seem to be taller. I found that the Speedometer seems to be about 3 MPH slower. In order to to figure the correct Mileage what percent increase in mileage do i need to add to figure my fuel Mileage??/ Thanks guy's Radar... ...

 

[bmoeller]

Here are some calculators- http://dodgeram.org/tech/specs/axle/rpm_vs_mph.htm

 

[Ted Constantine]

Radar with that tire change your speedo will be 3. 9% off. You will need to multiply you odometer reading by 1. 039 to find the actual mileage traveled and use that number for calculate your mpg.
HTH
Ted

 

[radar doctor]

Thank you

Thanks guy's Radar