Make her out of Carbon Fiber too (they're so expensive why not) and then she'll only weigh 5,000 lbs, add some giant LRR tires (I'm lauging as I type this) and the 23.x mpg average is within reason.

Then all the former H1 & H2 (plus other people who wanted one but couldn't stomach it) could buy them, cause they're "better" for the environment.