There is actually a word for it!

‘It’ being my little gas milage experiments, as I like to call them. I discovered this in the latest issue of Wired magazine. Here’s the entry:

Hypermile
v. To aggressively seek fuel efficiency,
even at the expense of road etiquette and safety. Champion hypermilers – usually hybrid vehicle drivers – shut down their engines while coasting and post photographs of their odometers on Web sites to boast of impressive (as high as 90) miles per gallon.

Hmm. Not sure I like being part of a community. Or, at least, not this community.