So much great info packed into this thread, already!
As it was mentioned, driving style is very important, but it's not all sadness and being a lame duck, as I drive with others and think about my driving 5+ years ago, we as a people waste fuel for no reason.
Racing to red lights, not paying attention to traffic, sticking in one lane while the next has zero traffic- the best thing to think about is keeping momentum. Even if you don't EOC, just coasting will be better than using extra fuel so you have to use more brakes later
I drive on a higher speed road sometimes, and at one point it goes from two lanes to one- and I drive 55-60 in the 55, while cars fly past me. 95% of the time, I blow past them and get ahead of them while they wait (IN ONE LANE, IN A ROW!) at the red light they raced to, or see them waiting at the next light that I EOC up to, and then bump start to go up the next hill.
Moral of the story, not wasting fuel often is faster than mindlessly accelerating (not saying you, but compared to the usual driver who doesn't
think about driving).