Hybrids benefit from using a burn-and-coast strategy which works well, but not so much for a conventional automobile -- especially a heavy one. For example, a tractor-trailer will benefit from constantly applied thrust.
A few things to add -- keeping a good air and fuel filter is important too. There've been some people on the MR2 community applying larger intakes and exhausts to get the fuel burning more efficiently, but that's a bit of a crapshoot. What matters isn't the amount of air, but the amount of oxygen you let in and the proportion to hydrocarbons.
In other news, I had one of my rare dreams this evening. It seemed like an episode of Real World in a way. It had a title sequence. All the names but mine were foreign and it seemed like it was shot in Turkey, though there's no reason it couldn't have been a number of places. There was a water taxi with me, two girls, and a guy. I don't remember what we were talking about, but he said that he'd have to check something with his girlfriend. I mentioned that I didn't know he had a girlfriend and the two girls giggled. It was explained to me that his girlfriend was actually his ex-girlfriend, but he still ran a lot of decisions by her and stuff. Kinda weird.
We got off the taxi and we were walking along this bridge. A building was built next to it and there was a balcony for one of the apartments with not more than a 3 or 4 foot gap. Through the sliding glass door came this guy carrying a large parcel. He laid it on the edge of the balcony and stepped across to the bridge. I was a little surprised and we started chatting with him for a bit. The guy had been in the title sequence, but I couldn't remember what his name was. The guy had amazingly large hands. He had a good joint and a half from my hands when we were comparing them. He politely interrupted and mentioned that the package was for me. I signed for it and woke up before I had a chance to find out what it was.