Gas mileage.

A few tricks here. If at all possible, always fuel up at the coolest time of day (yes, if necessary, 3 a.m.). When it is cool, the density of the fuel is greater thus giving you more molecules of fuel/sq.in. in your tank. This allows you to travel slightly further. Secondly, always keep your tires inflated to the point such that the contact area of the tire is only 1 - 2 long. This gives less grip for aggressive driving but is excellent for reducing rolling resistance and increasing mpg. At least once every 3 months run a fuel system cleaner in your gas tank. This will keep the "crap" that builds up in the system at bay, thus allowing a smooth flow of fuel from tank to combustion chamber, resulting in proper fuel delivery for proper performance under all conditions. Try not to make short trips! Cold engines do not perform well, especially in mpg. Try to schedule as many errands as possible into one trip instead of several. Don't carry unnecessary items in your vehicle. The extra weight is extra fuel consumed. Take off from a stop moderately. Taking too long or too short a time to get to speed burns excess fuel. Engines are most fuel efficient just below the maximum torque rpm. Try to keep rpm/gear ratio at this rpm especially on long drives. If you don't need heavy duty tires don't run them. Same for fancy wheels. They add a few hundred pounds of operating weight. Try to run the lightest tire/wheel combination that is safe to use on your vehicle. When possible, drive with the windows up. This gives the car a smoother profile through the wind by reducing drag. These are just a few things that i have learned over the years of trying. Of course there are more technical tricks too, but they are not necessary unless you really are trying to extract every BTU you can from your fuel.