To my surprise and delight the 2010 Honda Insight today reached and maintained 55 MPG on its current tank of fuel, now after several days of regular driving. Normally I'm seeing about 52 MPG and 54 if I'm really good. The average mileage for this tank may shrink by the time we need to refuel –climbing the hills around here is killer– but I consider 54 MPG a milestone, so I'm recording it as much for myself as anything.