[projektfu]

The Volt has a planetary gear system that is engaged at highway speeds when the gas engine is being used anyway. At certain speeds, it uses less gas to maintain speed that way instead of generating electricity and using it. When it is more efficient for the engine to supply electricity only, that is how it is done. I don't view this as a compromise at all. It wouldn't make sense to chose a less efficient path just to maintain some sort of purity.