my truck was getting 15 mpg on avg with a bully dog tuner cold air and stop exaust i put on a power max gogo stage 1 manifold cfm large mouth kit 4 inch turbo back driven regulated return kit head studs new stand pipes dummy pipes new stc fitting sct tunes from I D and now im getten 10-12 =( truck had 65k on it when i was getting 15 now it has 100k and im getting 10-12 HELP! WHATS MY LOST OF MPG is the 35k miles the diffrenace so i was thinking of snow pro milage max and a air dog 2 system i need advise pls also i put the new I D ficm flash tuner in the truck help pls assistance