Then what the hell am I doing wrong. I drive 70km one way to work and most of that is all highway. I was getting 700km on about 83 liters of fuel but have dropped to about 560 km on 90 liters. Bigger tires (285/75 r16 vs 256/70 R15) and have had the wheel alignment done. Seems to be sucking way less in town and I now drive about 95km/hr on the speedo vs 105 with the smaller tires??? I put the bigger ones on for better economy which was going against everything I was ever tought or believed in <img src="/forums/images/graemlins/lol.gif" alt="" />