Liberals and environment - Speeding uses more gas

Just got back from a road trip where I noticed that more than half the people on the highway were traveling faster than I was and I followed the speed limit. I expect that many of these were liberals because apparently at least half the people are and many of these displayed Obama stickers. We all know that driving slower will save energy and probably lower our carbon footprint. Isn't it ironic that the people who want to promote and force us to become "greener" cannot even set an example by driving the speed limit. Say nothing about the BIG vehicles they are passing me with.