When I put my new wheels and tires on I anticipated loosing some mpg but not what my calculations are telling me. I put 25.3 gallons in and that averaged 11.3mpg compared to my average of 15 with oem wheels and tires. Now I have my mph's adjusted to compensate with my current set up but how do I adjust total miles? Is my odometer now inaccurate? Thanks for any info.

John

 

Yes, your speedometer and odometer are off. You can fix it 1 of 2 ways. You can buy a programmer (most allow you to change the computer settings for tire size) or you could let the dealer do, probably for almost the price of what you could get a tuner for.

 

I agree.

 

I bought an Edge in Feb. but have not swapped it out yet with a Gryphon ( I haven't even hooked it up yet ). I did not know that that programmer would change my actual odometer and spedo. I thought that it would show my correct numbers on the programmer only. Good to know, thanks for your help.