4 year report

[brg88tx]

Originally Posted by teddy

Great post!



I suspect this isn't accurate. When you switch tire sizes it means the speedometer/odometer loses a certain % accuracy. Say it's 2%, when you drive 100km the odometer might only read that you'd traveled 98km. This will obviously affect your mileage calculations. I believe it can be fixed by having this stuff calibrated.

Of course you are probably losing some economy by having a larger tire, but not by that much.

yep, i have 195/60r15 tires also and they are 1.98% too large, so your odometer is reading 1.98% too few miles. when i calculate my mpg i take the total miles driven and multiply it by 1.0198 to come up with the actual miles driven.

i suspect this is where your 2% perceived loss in mpg comes from.