I'll make a note to sign up after my first fill up. I had been keeping track of mpg for my civic with gas cubby for iphone for the past year or so. 29.6 avg over the past 13 months. Not bad at all, but looking forward to even better mileage with my Eco. Put about 100 miles on it after pickup today..mostly highway. DIC instantaneous mpg was reading anywhere from high 30's up to the 50's, with the majority of time in the mid to low 40's. Someone else said it here before..this car just seems to glide on the highway.