For the most part as you mod them their gas mileage gets better unless you do a power adder or put gears in them. I was getting 23mpg on the highway when I had Trickfllow H/C/I and 3.55 gears. Ofcourse the hard part is keeping your foot out of it when you have all these mods 
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04 Screamin Yellow Cobra
KB 2.4 (585/556 pump 626/666 race)
00R brakes, DFX clutch, Level 5's, return fuel system, Lts with 3" exhuast, FR500 wheels and all the other fun stuff.
GONE 1991 Lx sedan 5.0, 5spd (Liberty proshifted TKO) S-trim, Ported TF heads everything parted out.
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