I'm considering replacing my 235/45R18 with something slightly wider for 1) Rim rash avoidance [primary] and 2) Appearance [secondary]. I'm thinking 245 or 255 but haven't seen any data on range/efficiency impact. It seems the people who have swapped for new tires don't typically care about range and don't track the difference. Obviously stickiness/tread life rating would be a factor too, so that ought to be in any data shared. I'm looking to move from the waving of hands and "oh, you'll lose 10% to 20%" guestimates to something a bit more measurable to help me decide if I can justify the change. With my LR RWD, I'm currently enjoying lifetime avg of 227 Wh/mi with aero covers REMOVED on my 18" Michelin Primacy MXM4's. I don't think these tires are particularly quiet, but I don't necessarily want to make them worse/noisier.