I've found my heavy right foot seems to work well, at least on city surface arterials. I tend to drive a bit faster, often hitting that magic sweet spot for efficiency for most vehicles, for me being between 70 km/h to 90 km/h (45 mph to 55 mph), depending on what the posted limit is, along with conditions, traffic, etc. I also tend to try to time for green lights, and plan ahead to try to stay in the most free flowing lane possible. My goal isn't fuel saving, but time saving. The added benefit is I tend to get better claimed city fuel economy. I've also since read somewhere that claimed acclerating using about half the travel of the accelerator is actually more efficient, again, being a little heavy footed, I do. Very gentle acceleration and WOT are not the most efficient according to this theory. Not sure if this theory has ever been proven or disproven, but I've only read about it once, and then never again.
My right foot doesn't work well on the highway, though. I take a small penalty for the cruising speeds I prefer (120 km/h or 75 mph).
And nothing really works for short cold trips, downtown driving or gridlock.