Doesn't surprise me that the 18's would cause you to lose MPG, not just because of weight (assuming you mostly do stop-and-go driving), but I'd be willing to wager the RE050's are more rolling resistant than the Yoko's.
If you do get those Enkei's tell us how the mileage goes with them! I'm curious to see how much effect the weight drop has on MPG's for city driving.
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