23mpg.
There's lots of room in the sky above you. You're in for one hell of a paradigm shift.
As a lurker you've probably come across it a few times already, but I'm going to drop it here for the record:
http://ecomodder.com/forum/showthrea...-mpg-5170.html
The biggest, and certainly most cost effective, change you can make is to the nut behind the wheel. Hint: that's you.
Tell us more about your ride, your usual drives, your usual driving style, and what you're hoping to accomplish. There's a huge pool of wisdom and experience (and an unfortunate puddle of snake oil) to take advantage of here, and I KNOW there are people who have useful insights to apply to your situation.