Well Ghost if you are looking at the GT with the 2.5l, If you drive like my grandfather you could probably get 24-26 combined, 3211111= on highway and 22-23 city only. If you drive like me highway only I get in the 28-30 range (based on 2 driving trips to houston from dallas - ave speed in the 80 to 85 range with a couple of short stints to 100). My combined is around 20-21. City only I have not attempted to figure out as, I do not do much city only. I run 89 octane.