21500 miles last tuned YESTERDAY Hmmm fuel filter havent changed that. And havent tried injector cleaner yet. But it makes NO sense to me whatsoever. When I first fill up my 1-2 shift spins the tires effortlessly but near the end of the tank cant do it if I try. In addition its just slower. I dont know why. Is a fuel pressure guage hard to install? Hell Id like to get fuel pressure and oil tempurature guages they should be easy enough to put in right?