If you really want to do something like this then getting a fuel tank that fits in the spare tire well like is used for waste veggie oil in diesel cars is most likely going to be the safe and easy way to go, but the cost and time you are going to invest in adding this 2nd fuel tank, you would come out ahead by doing other things that would get you better mileage, or if it's the time then the added time to install a system like this compared to the time spent at gas stations is going to take years to brake even.
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