Man thats a tuff one! I live on the western side of the state and got enough hills! My mileage dropped when I switched from 265's to 285's both on the highway and around town. Seriously about 2 mpg depending on how fast I was going. Right now with the PPE I average 18 on the highway. Around town I can get from 13-14. Better if I baby it.
Quote:
Originally Posted by n0useforaname  If I get 285's and change the speedo to my new tires, will it change my gearing and get me better mileage than if I didn't correct the speed? |
Theere is a sensor on the trans telling the computer cluster how many revolutions the trans is turning. Then the computer converts the revolutions to the speedo as a ratio to find the speed of the vehicle. When a programer resets the tire size it basically changes the ratio so the cluster is giving the correct mileage.
The gears are mechanical and in the rear end. The programmer cant change the gears or anything.
Ok I just gotta say it.... Get the 285's! If you dont like them sell em. Your like me and wont be happy till you try them! The mileage wont be a killer difference just 1-2 mpg off. Since fuel prices are down your wallet wont notice the difference as mutch! If you want come down here on a sunday. Ill throw my wheels on your truck and we can go for a ride!
Heres the pics that I have. If you want anymore let me know. Some of them are with my old 285's
265 
285 The bottom pic is flipped so its from the same angle. Or a right side drive dmax? 
