Purchased this bully dog gt and set up for a 2008 tundra 5.7 crewmax 4x4 that has a 3 inch leveling kit and 3 inch body lift.installed the performance setting and all I can say is wow.by no means is it like a diesel but for a gas it's very noticeable.as far as gas mileage the best was on the towing setting with throttle set to economy and shift points set to performance.before the bully dog I got 17-17.5 on the highway, now I got 18.5-19.6.around town seems to be in the 15's.
installation not for the inexperience
Had a very experience electronic tech. install it. He had to call on bullydog support many times. He said several times it froze on him.The part# was not enter in system. When he call bullydog they said they had afew hundred like that. After about 5hr installation was completed.I can really tell the difference in all around performance. However keeping foot off of gas pedal maybe a problem.
I'm not a computer savvy person but Bully Dog makes it easy.installed it myself 90% of the way then I had a couple questions and BullyDog staff was there to coach me through it the rest of the way.Once installed I went right for the performance mode. It took about three miles of driving before the tuner synced in with the truck. Better gas milage better throttle response and smoother shifting. It's worth it!