William, glad to have you here. The least expensive thing you can do is to change your driving style. Take a look at 100+ Hypermiling Tips, if you haven't done so. Tell us about you car and commune. How many mile on your car? Well maintained? Stock? Auto or manual? What is the commute like city highway or combination? Do you log your fuel mileage?
If you are looking to cut costs, can you carpool, ride a bike or take a bus? Is replacing the car an option? You could get a car that would get double the mileage. Keep us posted on your results.
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