Originally Posted by dodge dude94

Z rawk is right, 01 ORE's DID have 275-70/17's.

The build sheet will give the stock tire size it would have had BEFORE the ORE package was added, it won't give that size included in the package.

Originally Posted by xcentrik05

Ahh! i see i didn't expect that lol. So what's the tire size on the inside door? It shows tire pressure for 245/75/16?

Originally Posted by HeyYou

Larger tire = larger diameter. Speed counts axle revolutions to determine speed. With a larger tire, you cover more distance per revolution, so, speedo reads slower than what you are actually going.

Going to larger tires, even with a tuner, WILL reduce fuel economy for your driving style. It will be slightly better on the freeway.... but, I don't think you do enough of that to offset the around town losses. Re-gearing would help, but, it would take forever for the boost in fuel economy to offset the cost. You should already have 4.10 gears though, so, you may not see too much of a difference.

Originally Posted by gdstock

One thing to keep in mind when calculating mileage. If tires are oversized, do NOT use odometer to calculate mileage with or it will be calculated incorrectly. It will look worse thn it is.

Originally Posted by dodge dude94

You divide the mileage by the old tire size, in inches, then multiply that number times the new tire size.

Boom, fixed.