We were talking about on the highway, cruising where you don't need all the power your engine produces at a given RPM. Warm air is not just a governor. Warm air reduces the amount of fuel and air going into your cylinders, which does reduce overall power output, but more importantly, it reduces power output at cruising RPMs and fuel consumption at those RPMs.
No amount of bricks beneath the accelerator or anticipating stop lights will help you there. Neons get 30mpg pretty consistently on the highway. They are horrid little cars that get substandard fuel economy for a car their size. I got better mileage out of a ford contour, a bigger car, than a dodge neon.
Believe me, not everyone is looking for fuel saving modifications just because they drive like the rest of the children on the road. There are plenty of us who watch people behind us act frustrated it when we aren't flooring it all the way to the stoplight. Driving habits are only part of the equation if you want to save fuel.