Always perform regular maintenance on your vehicle. Use synthetic engine oil (if its compatible) and change it per your vehicle manufacturer recommendations. Synthetic for most cars and trucks actually lowers the engine's turning resistance, plus it handles higher internal temperatures without breaking down as easily. In short it helps your mileage!
Also keep your transmission fluid topped and fresh! Have it and the filter changed at least every 50 thousand miles. Keep the engine and engine bay clean, your filters changed regularly, and be sure to have it tuned up/checked out every year or so!
by DTMAce on May 10 2010
this tip works for 96% of voting Fuelly members.