3-on-the-tree?

Manual transmision can give you the edge in MPG if you drive it right, but driving style is much more important than trans type (or even engine size) for MPG. The great thing about a manual is that you choose your shift points, smooth or agressive, MPG or MPH, it's all up to you.

Did anyone see Top Gear when they drove a Prius flat-out around their track and tailed it with a BMW M3? The BMW got much better gas milage because it was not working very hard. The Prius got really crappy milage because it was being raw-hided.

Manual also can't be beat with glass-packs, Waaaaaaaaah-pop-pop-POP!! You can't get the same sound with an auto because you can't lift and stay in the same gear. Also, you can downshift to slow down going into a corner, and get on it on the way out. OK, these are not really MPG tips, but Gods knows they are fun things to do.