Weight reduction and engine efficiency are the most reasonable suggestions.

-Keep your car empty of dead weight. If you have some type of towing plan with your insurance (like AAA or something) you could eliminate your spare tire and jack.

-There are lots of routes to go on efficiency, depending on your budget. Rebuilding the motor and doing things to eliminate friction from the rotating assembly is a great start. Getting more expensive means doing things like head porting, thermal coating and upgraded internals.

Just look at your budget, and do what will give you positive results within that budget. It doesn't make sense to spend thousands of $ to net you an extra few miles per gallon.

On the MTL, just go with Genuine Honda MTL. I had Redline put into my tranny after it was rebuilt and went back to Honda MTL. The Redline seemed to behave like it was too thick and made my tranny seem noisy. I'm happy with the Honda MTL.

Speaking of gas results...I went to Sacramento over the weekend and my '89 Si made it there and back on less than a tank. I calculated my miles per gallon when I filled up this morning and I got around 34mpg. Not bad for a motor with 211k miles on it. My best so far was 37mpg going to the Pismo meet.