I haven't done the gas @35 because never run the Volt that way. I don't really care about the cost of running the car, I just like statistics which is why I posted the numbers. I bought the Volt because I like electric drive, I especially like how quiet it is and the absence of gear changes. At highway speeds the engine noise isn't very noticeable over the road noise, this is especially true at 72 where the Volt's engine seems to be smoothest. At back road speeds I find the engine noise very annoying because the Volt has trained me to be sensitive to it which is why extending the battery range at low speeds has become an obsession. I find myself coasting as much as possible, not only to stops but also down hills where I let gravity accelerate me farther above the speed limit than I would normally drive and then I give up the speed when I go up a hill. It's kind of weird because I'm not at all green, I'm doing it all in the pursuit of quiet.