Would take a lot of searching to find them, but a number of people on this thread have installed wider and heavier and had drastic MPG loss. One on here (XL) reported loosing 6 and 7 mpg with wider, heavier tires...he went back to his original wheels and tires that he had for sale and regained his MPG. Well I mean no offense but yeah going with wider tires than stock will almost certainly reduce MPG. I try to go with pizza cutter wheels and tires as often as possible, however nowadays they're pretty rare.