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I get the EPA isn't the real world. So, using the adjusted numbers of the 2009 VW Jetta TDI manual vs the 2009 VW Jetta manual:
30 city / 41 hwy = 27MPGe / 36.9MPGe
21 city / 31 hwy
So the actual difference is about 16% on the highway (and nearly 33% in the City?!). That does jibe with the efficiency of the engines. So, in theory if the engine could manage to be 54% efficient instead of ~42% that the TDI or 25% of the gasoline engine -- then the highway mileage would be 40-41.3MPGe. Not too great, really.
Keep in mind, that the Volt is rated at 93MPGe in EV mode, 60MPGe combo mode, and 37MPG gas only. The Leaf is 99MPGe Combined. And the 2010 Prius is 50MPG Combined -- the plugin will be better.
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