That's pretty close to what you're getting with ERDTT in a 2013 or later Volt. While it stays at a fixed 1400 RPM I've noticed that it does couple to the wheels somewhat once you're above 36 mph or so.I wonder how much gas would be consumed if one could just have the ICE idle for added charging and heat management purposes? Essentially a low generator setting with the use of it's heat. I think that would be ideal for my winter commute.
Maybe it was just me but it certainly seemed that ERDTT ran a lot more aggressively for the short time I had the OAT sensor removed (creates an open which is read as -40F/C on the toushscreen) a couple years back. I didn't leave the sensor out of the circuit long enough to verify the ICE cycling off/on in this mode though.Sort of. Except the engine will turn off once the coolant reaches a certain temperature. So you would still be drawing down the battery, just not as quickly.