well its tough to fit 20 sheets of drywall into a sport wagon or sedan...
i have a chevy 2500HD as a second car, i maybe get 15 mpg on the highway, probly 10 mpg around town. I really only drive it when the weather is bad or if I need to haul something, but these gas taxes that you are all suggesting would def be a killer to the average consumer, not to mention most construction companies (or other comp's that require heavy equipment hauling).
This is a valid point; however, you don't need a 2500HD to get through bad weather or to haul stuff (unless what you're hauling is a 40' powerboat, which itself is a MPG disaster).
CAFE was the only politically viable step since it wasnt "new" legislation, rather just an update to existing regulation. And BTW, the Feds took decades to raise it at all...the auto manufactures should have seen this coming since the new MPG is long over due.
Unfortunately, CAFE is not the right answer. I think consumption-based costs are the most direct, fair and effective regulation for all fossil fuels. Gas Guzzler tax increases and a gas tax increase would eventually lead to larger demand for smaller, fuel efficient cars. At that point GM, et al would be more then happy to deliver a cost-competitive small car.
So I see a conflict in the general make-up of todays automotive products. Too many cars are trying to be too many things to the buyer. IMO, I want a car for commuting/shopping/travel which is comfortable and gets good gas mileage. This car DOES NOT have to go 0-60 in 5 seconds, nor pull .90G in the skidpad. If I want a performance or heavy duty utility, I can buy a used vehicle which meets those requirements. Specialization of tools is a known engineering principle used to reduce complexity, and increase efficiency and reliability. The same philosophy can be applied to the auto industry.
Oh wait; it has been applied to the auto industry. Look at Europe in general and Italy specifically. Dont tell me Italians don't love their sports cars, because they do. But they realize a Ferrari should be driven on Sunday and the Smart ForTwo the rest of the week.