Well, the H2 won't really have to get 22mpg, because of the way CAFE works. As long as GM makes enough small cars that get classified as trucks (the HHR might qualify, same as the PT Cruiser did) that exceed their CAFE targets then they can sell vehicles that do not meet CAFE without any penalty. Or...they can just go ahead and pay the CAFE penalties. That's what BMW does since they've never been in compliance with CAFE. That's part of why BMW's carry a price premium; you're paying their CAFE fines in the sticker price.