Depending upon how one is calculating efficiency, a typical auto is around 12 -18%. The Prius concept improves on that extensively, mostly by avoiding idle and acceleration losses. But it still doesn't approach 35%. And not all (by any stretch) electricity for the all electrics comes from coal. Hydro in several areas provides alot of electricity.
Just the ability to burn hotter alone improves the efficiency of the heat engines used in electricity production.
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