FiTech EFI system

I have not had improved MPG on mine, if anything it is worse. I bought mine over a year ago for my daily driver 87 Ramcharger. Unfortunatly I have not had the success that others have had with there`s on here. My truck is no longer the dependable go anywhere truck it was before. I have sent the unit back 2 times now. I have the FCC and have gone through 3 mecanical fuel pumps now and no body can tell me why. I have since bought a newer car to drive while my truck sits still till I fugure out how much more money I want to throw at this. The last time I sent it back to FiTec they did not mark it a warranty claim and I had to pay Duty on it coming across the boarder again.
Good Luck