The worst thing about the fuel crisis

Has anyone noticed when driving along that everyone is doing 5-10mph below the speed limit? What's that about? Just because fuel is a little more expensive, I'm positive that the benefits of dropping your speed down so much and causing yourself to be late everywhere will have no bearings on how much you spend. Maybe you'll be able to buy an extra Mars bar a month or something. It's fricking annoying guys! Sort it out!