Same if not better mpg because I purposely stayed with 17's (although I really wanted 18's) and I intentionally took weight (and cost) into consideration. I think I'm at 41 lbs per corner (21 lbs per wheel and 20 lbs per tire) vs. stock weight of 44 or 45 lbs. Unfortunately, I drive kind of aggressive anyways, so I'm not seeing the mpg Honda says I should. Plus, I put weight back on with subwoofers and added spare tire/jack/tools..🙂