26. Clean EGR Valve.
27. Cold Air Intake* and Turbochargers*.
28. The closer your car is to the ground the more aerodynamic it is.
29. Slowing down immediately when a red light is seen, by the time you reach the stop the light will most likely change to green.* You will see many cars rush to a red light and suddenly brake.
* There is skeptism if an Cold Air Intake or a turbocharges would improve their mpg. Each car is different and reacts differently to upgrades. The automakers already tried to build the car to its maximum efficiently. If these upgrades are beneficial then why don't the cars they produce have cold air intakes and turbochargers? Some diesel cars actually benefit from having a turbocharger,