it also depends on where you live. if you live where there are a lot of stop lights where you sit and idle a lot or a lot of stop and go traffic that kills your mpg. i am sure if i checked mine in town with the stoplights, etc and nothing else i would average 17-19mpg. i have checked mine multiple times though to the track and back (over 400 miles round trip) and i always average between 24mpg and 27mpg every time). but that is 99% interstate driving.

my drive home from work is almost all downhill so i could nearly coast all the way home if i needed too lol. that does wonders for your mpg

you should see the great curves i have to work and back, it makes the 12 mile trip each way a blast.