Of course the ultimate in fuel efficiency would be a Plug-in hybrids (you can't really buy 'em right now, you pretty much have to make 'em yourself or have someone retrofit a Prius or something for you). The gas engine doesn't kick in until after you've gone 40 miles or more, when the battery runs out. Since my last fill-up, I averaged just 28 miles a day. If I had a plug-in hybrid, I might not have used any gas at all these past two weeks!
Don't forget, folks, as we rejoice at "cheap" $2.11 a gallon gasoline. Hybrids are much more than about saving $ on gas. It's about reducing emmissions, and eliminating our dependence on foreign oil. Buy a hybrid today!