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Not enough information for anything more than wild guess. If the new tire & wheel assembley weighs less but is the exacty same diameter maybe a slight gain in mpg. If your new tire wheel assembly is a larger diameter, you might gain FE if you drive more highway but your speedo will show lower than actual speed. Way to many variables for any think than a guess.
If the wheels are really cheap like $20 each, keep your eye out for some slightly taller tires than your current tires, say 5-10% ones used would be better, stick them on the rears drive wheels and track your mileage. Most likely the speedo is tranny driven so it will show and error. If your mpg seems the same you actually gained.
I don't think you'll save enough $$ justify throwing away good tires. But if price is right and you like the look, find some used rubber and give them a try.
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