Corrected MPG
Adjusts trip-computer MPG for the odometer error a taller tire introduces.
MPG impact
Enter your indicated MPG and tire sizes to get the corrected figure, plus an annual fuel-cost estimate.
In short
Corrects indicated MPG for a tire diameter change, since a taller tire makes the odometer under-count miles.
What it does
Adjusts trip-computer MPG for the odometer error a taller tire introduces.
Estimates yearly fuel spend and the difference between two fuel-economy figures.
Separates the measurement correction from the real 1 to 3 mpg loss bigger tires usually cause.