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Well, getting mileage up on that 4 mile commute isn't going to be easy. Those short trips are mileage killers. Definitly look at the 100+ hypermiling tips on the site. That'll show you the largest gains. As for mechanical stuff I'd pump up your tires to the maximum sidewall pressure. This will help your car roll easier. Other than that, I'd suggest some sort of grill block to try to warm the vehicle up faster (less time at high idle). Maybe even a block heater if you have access to a power outlet where your car is.
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