Although the finished product works well enough, it’s also becoming increasingly apparent that the Volt missed two key project goals. GM’s oft-stated promise that the Volt would achieve 50 mpg in CS mode is history. The fact that GM felt the need to optimize the fuel consumption of the Volt by using premium (required, not just recommended) indicates how rather inefficiently its serial-predominant hybrid system works. It’s not a matter of ragging on about that; it’s just a surprise to those of us who argued endlessly which system (serial or parallel) was more efficient.

And now another long held Volt assumption is deflated. Based on GM statements made during the Volt’s long development, the universal understanding was that the Volt would use 8 Kwh of its 16 Kwh battery pack to achieve its 40 mile AER goal. It now turns out that 10.4 Kwh will be utilized. Sounds like small potatoes, but there are three not insignificant consequences as a result: (Read More…)