Proper Tire Inflation
Properly inflated tires last longer and increase fuel economy. Every decrease in pressure by 1 pound per square inch for four tires can decrease fuel economy by 0.3%. Some fleets use nitrogen inflation, tire pressure monitoring systems, and other technologies to maintain optimum tire pressure.
Recommended Motor Oil
Fleets can improve fuel economy by 1% to 2% using the manufacturer's recommended grade of motor oil. For example, using 10W-30 motor oil in an engine designed to use 5W-30 can decrease fuel economy by 1% to 2%. Similarly, using 5W-30 in an engine designed for 5W-20 can decrease fuel economy by 1% to 1.5%.
Motor oil labeled "Energy Conserving" in the performance information contains friction-reducing additives that improve fuel economy.
Tuning a neglected vehicle or fixing one that failed an emissions test can increase fuel economy by 4% based on the repair type and quality. Repairing a serious problem, such as a faulty oxygen sensor, can increase fuel economy by 40%.