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My gas mileage already sucked B4 my S/C. At WOT I can see the hand on the fuel gauge move
a little. The FMU may have something to do with that, I dunno.
I get 16 mpg with my setup and i dont daily drive my car its to take out and beat on it so its always ran hard i use to have a 01 silverado blown with an FMU and that thing only got 10MPG so think an FMU does have alot to do with bad gas mileage but i am no fuel economy expert so i could be wrong