Quote Originally Posted by SilverBullet75 View Post
Interesting...
In my mind, if the tire is rotating 1.8% faster, and at speedo 60, true speed is 58, wouldn't that mean that the ODO mileage is off by a bit... should be less than 411... which would mean that the MPG should be lower instead of higher. ??

I'm in no way a mathematician... actually, I suck at math. So, please help me understand this. Thanks!
no, I think it's when the ODO shows 60 mph, your ACTUAL speed is higher, so we're in danger of speeding and not knowing it...a bad idea around the cameras in AZ! I did mine with my GPS unit and found at 60 mph on ODO I was actually going 66 mph, that's with my 285/60-18s.