8 mm wires, open cone with ram air hood, iridium plugs, sythethic oil, clean throttle body real good, clean engine real good (clean engine = less heat) added the behindg the grill inserts from a 99, tires properly inflated no excess weight in trunk. at 85 I get 23mpg if I can keep it to 70 = 28 mpg 55 = 32mpg that 55 is very rare