Originally Posted by
gotdiesel
If you go to a taller tire, make sure you recalibrate the speedo/odo, to get a
correct mpg calculation. A 29" tire will have about 710-715 rev/mile
and a 31" tire will only have about 675-680 rev/mile. It will have slight difference on the ODO.
Just a thought.
Greg
Without recalculating the speedo, just figure out the difference in tire size (eg. 4%). Then when you go to calculate mileage, take odometer mileage and multiple it by 1.04 (1+4%) and you have the actual mileage traveled. Then divide by fuel used for your actual MPG. My tires are 3.5% taller than stock. It calculated to a speedo error of about 2-3 MPH at 65 MPH.
Art.
Art Paltz
1999 Suburban K2500 6.5TD (stock)
2000 Undercover Dragster, 468 BBC, 7.74@173MPH, waiting on new 622 aluminum BBC to be finished.
1992 Tube Chassis Camaro, 468 BBC, 8.54@157MPH (SOLD)
1987 Buick Grand National, 11.8@114, pump gas (for sale)
1969 Camaro SS/RS 396-350HP, stock restoration, it never leaves the garage...