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Welcome to the site mikel09.
If you are here for ROI you'll definitely want to look at the 100+ hypermiling tips first. That'll be your biggest gain area. Mods, unless you have materials laying around cost money and the ROI (especially now with low gas prices) are going to be fairly long. However, there are a few simple things that you can do for low prices that would probably help. A grill block comes immediately to mind.
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