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It is not as hard as you may believe to see some major improvements in your gas mileage while you drive around.  After all, some of the very best methods for improving auto gas mileage are also the simplest methods.  For instance, you can change air filters, inflate your tires properly, get regular oil changes and tune-ups, and drive a bit slower on the highway (generally 55 to 60 miles per hour is best).  Also, coast to red lights instead of continuing to accelerate, and do not let your car idle for more than thirty seconds at a time, which means foregoing the drive-thru or turning off the engine for quick trips inside the convenience store.