I am a newbie and have watched the videos about "gliding" and maximizing economy. People seem to agree that keeping the car out of EV mode is best. With the C, I have noticed that the only way to get good city MPG is to keep the car in EV as much as possible and recharge with good braking technique. Without EV, the est city MPG is in the 40's. In ECO mode, trying to keep the engine from starting, I get better than 60MPG on the street. On the freeway with the cruise set on 65, I average well into the 60's MPG. I have a short commute and what kills my averages is getting on the freeway so the best average I can get so far is 58 MPG for the trip.