Chuck - Thanks for being the guinea pig. I have a set of 17s (not really lightweight) from my old Accord that would fit the HCH, but I've been hesitant to put them on because of the MPG hit. After reading about your experience, it doesn't sound as bad as I would have expected. What are the specs of the tire you are using? And did you even consider a pricier LRR 17 inch tire?