Yeah, my other vehicle is a Dodge Ram 4x4, I put oversized all-terrain tires on the stock rims that are about 2" larger in diameter than the stock tires. It throws my speedometer off by 17%, at highway speeds my truck's speedometer is about 7-8 mph on the low side - like you said, you get used to the discrepancy... one positive for having larger tires is that your odometer doesn't register as many miles as you have actually traveled - a plus if you ever resell the vehicle, lol...
