The Drive 55 Conservation Project...

...I'm not really old enough to remember the Drive 55 movement from the 1970s, but those that are tell Daily Sprawl that the new Drive 55 Conservation Project is a very retro response to Peak Energy.

And, one that makes alot of sense when you consider the cost/benefits:

in a family sedan, every 10 mph you drive over 60 is like paying 54 cents per gallon more for gas you bought at $3.25 a gallon. That extra cost is even higher if you're buying more expensive gas, and for big SUVs and other less-efficient vehicles
...
And the time you save by going easy on the accelerator may not add up to as much as you thought. On a 300-mile trip, driving 65 instead of 70 mph would cost you only 20 minutes -- but save money and spew less carbon.

So, if you're looking for cheaper gas, it appears that your own gas pedal is an efficient place to start.