Originally Posted by scottf200
Interesting observation. As we have speculated before GM has programmed the system to run the engine at lower RPM than where the SFC islands are the best. ie one would think that a higher load point would get better SFC out of the ICE than 2200 or 1500 RPMs. They probably do this for 2 reasons: 1) NHV and 2) betting that perhaps some regen will come into the picture and the juice would be "free".
There was a thread where this was discussed and Herm was pointing out that the Hyundai Sonata picks a higher load (for better SFC). Also we have discussed a mode that could be added to the software whereby the driver could select the higher load option. This might be useful if one knew that they were going to be on flat and level road for a while. Run the engine at a higher load and better SFC and fill the battery up to it's buffer zone max of 1.6 kwh, then shut the engine off for around 5 minutes.
2012 Silver Ice Volt w/ leather and polished aluminum wheels