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On the highway, a non-hybrid with whatever specs (CdA, W, Crr) would do just as well as a hybrid with the same specs given the same gearing. No weight loss is needed. In the city, the weight loss would have to be extreme to even get close *given the average driver. The XFI at ~1600+lbs pulled ~59mpg on the FTP-7* while a new Prius at ~2900lbs pulls ~72mpg. In order to get the XFI to 72mpg given a conventional gasoline engine it would have to approach the weight of a large motorcycle.
*Obviously someone can do better by driving efficiently (P&G and whatnot) , but since we're looking at the EPA tests we need to use the same driving style.
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