On highway trips I've gotten well over 28mpg. When I used to drive to work 24 miles each way with at least half bypass/highway I got around 22 mpg (19 in winter due to warmup, winter blend fuel, etc) When I moved 7 miles closer mpg went up about 1 mpg. I've changed jobs, drive about 14 miles, but mileage is around 18 mpg because of all the hills/mountains I now climb to and from work.