My tune-up consisted of changing the plugs (installed Autolite 764 AP's gapped at .054"); badly needed as the 5 Autolite 764 copper cores were not gapped/undergapped and the number 1 plug was a Motorcraft Platinum with barely a center core. New plug wires: Advance Auto Xacts. Cleaned MAF sensor and throttle body. Ran some Seafoam through the 2 little vacuum lines atop the UIM. Changed oil and filter. Before all this I was getting around 25MPG and now I am getting around 25MPG; but it has better pickup. I do have 3 CEL codes; 2 for the upstream bank 1 H02S, and one for the EGR. Could these 2 items be causing my MPG to remain the same??

Later. Pepse.

'95 Mystique LS Young America, Moonlight Blue, V-6 ATX, LOADED. REMEMBER: Always fasten your seatbelt as it makes it harder for the aliens to suck you out of your car.