I purchased me a 97 ford tk. drove it home from ka. and checked mileage 12.4 mpg , then I grooved, first tank showed 20.2 mpg. I just got home from another trip and filled again wife was with me did a mileage test 25.4 mpg Her words "holy crap I`m gonna have to start driving this instead of the chev. cruise at this rate!!!!! " Guys the groove works, do the mods do the mods do the mods,fuel trims -11 long - 6 to -8 short nothing special. Now this is very impressive the very best % I have had yet, and on my own vehicle. So lets all get these things going. Ive done alot of different things but this engine with the groove has amazed me. This will be my next reformer guinea pig subject, I cant wait to see what it does. Dan gadgetman Mo.