Dodge Diesel - Diesel Truck Resource Forums - 35 inch tires 16.2 mpg. what is the real mpg?

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35 inch tires 16.2 mpg. what is the real mpg?

i know the 35 inch tires are throwing the speedo off. I drove around town alot today and the truck averaged 16.2 in town. I have 325/65/18 tires, which are 35 inch tires , How much mileage am i getting. Sorry about 2 questions back to back, but i am caught up with this truck tonight[roll]

Quote:

Originally Posted by bigfish5 (Post 1133850)

are u hand calc? its about 1/10 mile off to the mile. so if it reads 200miles its about 220miles.........i average 16. can get 18.....can get 14[duhhh]

Depends on the gear ratio and original tire size the speedo was calibrated for.