Only easy if the terrain is fairly flat. Add some hills and it's definitely more difficult. But yes, in the summer when heat wasn't needed I could go for days with little to no ICE use. And I had one tank of gas that the MPG was almost 350. I filled the tank at around 1400 miles, and it was still half full. I just wanted some fresh gas in the tank. Plus, I was going on a long freeway trip so I wanted to record the MPG before the trip hammered the MPG.It is really easy to keep the ICE off in the PHEV. No cabin heat and keep the Eco gauge needle IN ECO. If you go into the power bar, the ICE will fire.