Well, I've got 32's on mine, and my MPH at around 65-70 is only off by a max of 3 mph (GPS verified).

When I've run the GPS for mileage, I get just about 290-310 miles per tank on the GPS, when the odometer reads about 270-290 miles (going off of memory here, but actual mileage is slightly higher than odo mileage).

Not sure how this relates to a stock truck though with OE tires, or 33's. I only kept track after the 32's. <img src="/forums/images/graemlins/confused.gif" alt="" /> Hope it helps!

Sean - Orange County, CA
MAIL: seanwilliams78@gmail.com
1995 Montero SR - For exploring and getting away!
1994 Volvo 850 Turbo - 402hp and counting!
1966 VW Bug 2275cc - For stoplight drags!