To add to what DifferentPointofView said, a hypermiling is simply consistantly driving to achive greater than EPA estimated fuel economy. That doesn't mean you have to pulse and glide. There are a ton of other driving techniques you can use to increase mileage.
Before thinking about mods you should make sure the car is in good working order. After you know things are working well you can start doing some mods.
As for mods, what is your commute like? Highway travel is a great opportunity for aero mods. City driving is a great opportunity for engine warm up mods. Describe your commute and we can get you started.
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