Check tire pressure. There's a 1percent loss of fuel efficiency for every 2 PSI under maximum pressure (usually in the 35-psi range). So if you're running at 26 psi, you're giving up about 5 percent fuel efficiency.
 A synthetic motor oil can improve fuel efficiency. You can realize a 5 percent to 10 percent gain by switching to a synthetic motor oil such as Mobil 1.
 Take out the added weight from your vehicle. For every 100-pounds in cargo, you're burning about 2 percent more gas. Avoid putting cargo on the roof, which diminishes gas mileage.