Posted by bjb in Tx from Ne on August 11, 2009 at 07:50:22 from (141.197.12.183):
In Reply to: I'm Confused - OT posted by ddl on August 11, 2009 at 07:35:29:
The difference comes from the ability of the Volt to plug into the wall every night. Since most trips are short, and if you plug it in every time you get home, then theoretically you would use no gasoline. The gas motor only kicks in on longer trips, in which it behaves like the Prius. You would have to see what the highway mpg is for both to compare apples to apples, not just the combined MPG. It would be dependent on how long of the trip would be without plugging the volt back into an outlet. The longer the trip the lower the average MPG highway for the volt would become.
On other questions someone might bring up is that with plugging in electric cars, the electricity has to come from somewhere, I am not sure if that is considered when making the calculation. One benefit of using a large power plant to produce the electricity is the thermal efficiency is much higher than a gasoline engine. Most power plants run above 90% efficient (less than 10% lost as waste heat), where internal combustion engines are only around 30% efficient (70% lost as heat).
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