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Welcome. I will probably display my ignorance, but is your car a two wheel drive, four wheel drive, or full time AWD? Is it automatic or is it manual? Is it possible to switch to a transmisson/differential with a lower final ratio?
Generally, if it is an Automatic, it will cost you something in mileage. If it is anything more than two wheel drive, it will generally cost you about a 20% penalty.
Both of these options will give you a hit. If you have 4 wheel, can you convert to 2 wheel and how close to 2 wheel is it. For example you might be able to take out an intermediate shaft, but you might still have a rear differential which is spinning and taking up energy. How much? How much is it worth to change? Is it worth it?
Given what you have is what you have, for now, you could do a scangauge, higher tire pressure, grill block? Beyond those, the mileage differentials become esoteric, since a 2% increase on 18 mpg is just not a big enough number to be even really measurable.
Best of success.
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