i didnt buy the fit for mpg although the AT gets about 34mpg and with my MT driving, i get about 31mpg on regular gas..and i dont drive slow at all. that is more than plenty for me. i dont really care about mpg.
my G does only about 15mpg on premium for the congested commute...not that i have trouble paying for the fuel or anything. driving the G to work has its own greatness for me.
im not here to sell you the fit. but i can tell you that the fit is the benchmark of this segment and has good reasons why it is.