Apparently I didn't do such a good job in this post explaining why I found this New York Times article on higher-mileage, gas-electric hybrid SUVs so troubling. So I'll try again.
To recap -- the Times article claims that, under the system governing vehicle fuel economy in the U.S., selling a hybrid Escape lets Ford sell an additional Lincoln Navigator without running afoul of federal CAFE standards. In other words, while buying an Escape may mean that you're driving a more efficient vehicle, it doesn't mean that the average fuel economy of all the Fords on the road will change one whit.
A couple commenters over on my blog mothership said this is bunk. But I think the article is on to something.