I have a 306 with head work, cam, full exhaust 24# injectors and I get 18 around town and 24mpg on the freeway. Check to see if your mass air meter is calibrated for your 19# injectors. Your fuel pressure is way to high, mine is about 38psi and it still might be high. Start with it set at 36psi. Also I would check on the availability of getting your car put on a dynomometer. That would help with tuning it. Your fuel pressure is to high and your computer is trying to lean the motor. Start with turning it down. Good luck. I bought a Focus so I didn't have to worry about the Mustang for commuting to college, 700+ miles round trip. $26 in the Focus as apposed to $80 or so in the Mustang. Again good luck.
Brent
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Black 1990 LX DSS Racing Super Pro Bullit 331, AFR 185, Anderson B31 Cam, 1.6 DSS rockers, Cobra Intake w/ 2 phenolic spacer, Aluminum DS, 3.73 gears, Tremec 3550, Lakewood SFI Bellhousing, MSD Digital 6+, Spintech Side Exhaust,
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