If I try hard, I can get 33-35 mpg on the highway, 30 mpg combined... with that said, it's HARD to drive this car in economy mode because it is such a hoot to drive. 28-29 mpg combined, driving it like it was designed. lol. Oh and I am back to 91 octane, stage 1 map and won't change anything until I get Race Access next month.