I don't think you're getting the best possible mileage out of your car. I have an '89 240sx w/ KA24E SOHC, HyperGround Kit, Magnecor ignition wires, SplitFire 3xPlatinum plugs, port/polished head, throttle body, intake plenum, manifold (removed SCV valve (secondary butterflies)), air filter adapter, polished MAF sensor (only on main air inlet), Hotshot Headers (and gasket are port-matched to the head), ThermoTec exh. wrap, Random Tech cat, new 180SX fuel pump/in-tank filter, new 195cc injectors, 300ZX fuel filter, Injen intake, HKS Super Mega Flow air filter, and STOCK EXHAUST (race exh. is for the races only, cops y'know). Everything on the car is in excellent condition, sensors, valves, vacuum hoses, car is driven hard but very well maintained. According to my measurements, I'm getting about 26MPG. How accurate are my measurements? Simple, do the only way possible to find the exact figures. You get two (2) separate 1gal. gas containers, drive your car until it's empty, RESET THE MILEAGE COUNTER, add 1gal ONLY, and Drive you car on the freeway. Where I live, it's 30-35 miles to Downtown Los Angeles, and I had to go anyways because it's the only place that I could find that carries the newest Japanese race/drift videos and mags. I ran out of gas exactly 26 miles later doing 85-90 on the fast lane with light traffic on a Saturday, took me about 25 min. getting there. Now use the other gal. of fuel to get you to a gas station. This is just my personal experience that I pass on for others to read. Hope it helps you in some way.
[email protected]