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Changing tire size

Posted: Wed Jun 07, 2006 8:40 pm
by Viberrrr
The question was just asked in another posting how easy is it to change out the overdrive. I'm assuming to improve mpg. My question is would changing to a different tire size change the gear ratios enough to effect the gas mileage? I don't care that it would effect the speedometer if it improved things by 1 to 2mpg

Re: Changing tire size (Viberrrr)

Posted: Wed Jun 07, 2006 11:03 pm
by djb383
The Vibe 1.8L is not exactly a torque monster, so going to a larger diameter tire just puts that much more load on the the engine and drivetrain. The factory has already figured out the best overall diameter for performance and economy. My $0.02.