Different tires
 

Can I change tire profile on my 2007 MX 5? Assuming I will have the clearance I would like to go from the low sidewall performance tires to the higher sidewall tires to increase circumference and mileage. I knoow the that this will affect speedo but I use GPS for metrics anyway. I'm not even sure the wheels accept a different ratio [more conventional] tire.

OK go ahead and yell at me.:cool:

If your only reason to change tire size is to bump your fuel economy, don't bother, any change you may get will be virtually immeasurable.

Thanks I kinda knew it. one inch change on diameter would give me 3.14 inch more per turn or about 3% gain, maybe 0.75 mpg boost.

Nope, more like a 0.01 boost (if that much).