[gbbuilders]

I've gotta say I was pretty disappointed to read these response. I was looking for some people that know what they are talking about. After all, you bought a Toyota, there's gotta be something up there. To increase power and mileage you just have to go back to the basics. Make the engine work less. The Tundra's fan is belt driven which creates alot of resistance on the engine. Perma-Cool makes a great electric twin fan assemble that fits right in the Tundra. It averages about 5 mpg better. Depending on how much you drive, this system should pay for itself in less that a years time despite its $530.00 price tag. K&N claims 2-3 mpg for its 77 Series Intake. Now that the engine can breath in better, let it breath out. Headers if available for your model (Not available for my '05) and stainless steel exhaust. Last but not least, aerodynamics. The tailgate on the bed of the truck is a huge air dam. I installed an ARE hard cover tonneau, but even the soft covers are better than an open bed. Or if you prefer a cap. Everything mentioned above will improve mileage and performance on the Tundra or any truck for that matter.