It kind of irks me when Obama says in his speeches that cars made by "fellow hardworking honest fellow Americans" are the most fuel efficient cars in the world (or some of the most).
Here's the data on global fuel economy, measured from four different perspectives. And guess what? We're LAST, compared to the rest of the developed world represented in the data.
Note that Canada follows the same vehicle standards as the U.S.. Both of their targets and requirements are the same. The only difference arises between their respective historical performances.
Taken from page 21 of this PDF.
But it makes sense. We drive the largest vehicles in the world (i.e. Ford F-series traditionally being the best selling vehicle, mostly due to fleet sales) and our emission standards are different. Based on my internet reading, we focus more on "cleaner" emissions rather than fuel economy.