i can drive 70 all the time on the highway and get almost 36 mpg with regular 87... it jumped from 29 when i bought the car, but i also changed the front o2 sensor, the oil, the air filter, the fuel filter, the pcv valve, and the exhaust.

99 Contour LX MTX, Cone Air Filter, Custom Grille 95 Neon ATX Intake, Ractive Muffler, Green Painted valve cover, fuel rail, and intake, b/w painted interior, white exterior trim, shaded tail lights