I realize that you said you've done alot of work to this vehicle, but how much do you need it? could you sell it for enough to buy a more practical vehicle that gets better mileage and is most likely going to cost you less to keep on the road?
Otherwise, like others have said, Belly pan and tire pressure are good places to start, make sure that the mods you are making help, like the cold air intake and throttle spacing, do they really help?
Another way to look at it is to figure out how much you spend on fuel and budget that amount out, saving any extra instead of spending it.
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