Ok, I got my first tank of gas today. 335 miles and 8.900 gallons. Works out to be 37.64 miles per gallon! Pretty good for first tank. Pretty good and I think it will only go up from there! Especially good considering it was the tank the dealer purchased prior to delivery. I was mostly in normal mode but about 2/3rds of the way went into ECO and saw an dramatic increase in MPG as each day went by. I didn't feel any real need to switch out of that mode and think that is the way it will stay 85 to 90 per cent of the time. I can forsee a time in the very near future where the milestone of 40mpg is around the corner. It seems so great, so far. I am enjoying every drive and have found VERY few things that I would change.