I have an 86 N/A W/ the Racing beat true dual exhaust, K&N Intake, pineapple racing 5th and 6th port sleeves, light weight crank and alt pulleys, no A/C no P/S ( replaced w/ manual rack) and no air pump. I have never pre-mixed and I have 269825 original miles on the car. i get about 280 miles per tank and use 87 oct. and shift @ about 7,000 every shift (terrible but true, the injectors have been re-built more than the fuel filter has been replaced). the only thing i do is change the oil w/ castrol 10w/40 every 3 months or 3k and change the plugs every 30k or as needed.
may be just me but the best thing you can do is change your oil regularly and drive the piss out it! screw the gas mileage
