Hi everyone just like the title says really bad mpg for a 4 cylinder turbo id say . Its been doing bad since i got it 3 months ago and been emptying my wallet with 4.29 a gallon at the pump !! Ever since ive done a tune up change spark plugs motorcraft . Cap and rotor motorcraft. Replaced fuel filter. And no luck at all.. I shift smooth under 3000 rpm . I got the boost set up to 14 psi. I don't know what the problem could be any ideas?