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Well, if you start with the EPA rating, then the payback period is much shorter. You're already ecodriving, so that is "free", and you are already saving that money, so if you spend $500 of that savings, and increase your savings then you have already paid for it. If you were not already ecodriving, then the savings from the boattail would be quicker, because the baseline is lower and you would be spending a lot more on gas.
Does that make sense?
How much would the materials to make a weather proof version cost?
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