After about 2000 miles on my car and no gas put in, I took my first road trip from Salt Lake City to Las Vegas and back. My EV range showed 53.4 and my HV range showed 1000 after I filled up. The elevation at my house in Salt Lake City is about 4800 feet. Las Vegas is 2000 feet and there are a few mountain passes that are about 6700 feet. The speed limit between SLC and Vegas is about 20% at 70 mph, 15% at 75 mph and 65% at 80 mph. I drove EV about 4 miles to the freeway and put the car into HV mode once I hit 50 mph and left it there until we pulled in for gas. Once I got back on the freeway and hit 50 mph I put it back in HV mode. We had 3 adults and about 50 pound of luggage for less than 500 pounds of extra weight. The problem I had was that the engine was running at high speed and was very noisy for about 70% of the trip. I spent several years when I was younger racing cars with a tachometer and got very good at estimating engine RPM by listening. I felt the engine was running between 4500 and 6500 RPM for most of the trip and was very noisy. I went into INFO and then Vehicle Energy on the display. When the clutch is engaged and the engine is connected directly to the wheels, a little circle appears where the lines cross and go to the wheels. I found the clutch was only engaged about 15% of the time. When it was engaged, the engine was quiet. I didn't get a chance to charge the car in Las Vegas and when I got home the EV range had dropped to 17.2 miles. I feel this is a great car for around town and a poor car for freeway driving.