Whoa! I had no idea the difference would be that obvious. :rockon: Yesterday, I took the "along the river" route to work. It's 17.2 miles long with a top speed of 55 mph on some roads that are quite scenic. The purpose of that particular drive was to go as far as I possibly could as far as I could using only EV accelerating as fast as possible. That extra push from the battery resulted in a drop of maximum range from 14.1 to 13.0 miles. But that electricity scarifice prevents you from holding up any traffic. You accelerate at the same speed as everyone else. When reaching the depletion point, the engine started. It's not the ideal, since using the hybrid system can be more efficient overall than electricy-only driving... especially with a battery-pack that's 4.4 kWh. The result was 250 MPG. Today, I took advantage of the HV/EV button. Taking the same route, I fired up the engine when the first need for acceleration came up. I briskly accelerated, knowing the engine running optimally will end up recharging the battery-pack a little bit as a result. After all, that's the point of a FULL hybrid. The system focuses on overall efficiency, not that of the moment. Once warmed up, I pressed the button again to shut the engine off. It was now available for a quick on & off later. That came when a steep hill climb was needed. Then things got interesting. MPG will unexpectedly high, close to 250 and there was plenty of EV available. Later when I arrived at my parking spot, there was 1.3 miles still remaining. And to my delight, on the display it said 310 MPG. The HV/EV button allowed me to use less electricity and less gas. :whoo: My expectations weren't to see so much of an improvement. That was amazing!