Mine is new - only 800 mi. now. I filled up on way home from dealer and then refilled before a 400 mi trip. 1st 1/4 tank (same station, same spot and tried to fill to the neck) 17.4 mpg rural driving. 30 - 50 mph, some stops, up and down the hills.

Next time, again refilled at exact same spot. 385 miles from Connecticut to upstate NY and back. 2/3 highway at 60 - 65 mph and 1/3 local roads around the lake. 21.1 mpg. I was taking it pretty easy so this may be the best I ever get.

Next tank is looking good too - at this point over 200 miles at 3/4 tank. I haven't reset the fuel indicator but it seems like its pretty darn close.

All in all, exceptional fuel mileage! I considered a gasser but everyone I talked to said they got 10.5 - 12 mpg. The trick will be to take it easy. I'll bet those injectors really pour the oil to it when you jump on it.