I was re-reading this post and remembered something one of the fuel systems engineers at the "Big" car company where I worked told me. He pointed out that using the brakes is a real negative for fuel economy. Look at it this way: The brakes convert kinetic energy (energy related to mass and velocity) to heat energy which then gets thrown away into the atmosphere. If you throw away this heat energy, then you have to replace it in order to keep moving on your journey. It gets replaced by the engine which converts fuel into mechanical energy. The more you use the brakes, the poorer your fuel economy so your riding style will have a great deal to do with the fuel economy you experience. Stop and go driving just kills fuel economy because you have to keep using the brakes to keep from smashing into the folks ahead of you. The electric and hybrid cars are more efficient because they don't throw away all of the kinetic energy but use the energy to partially recharge the battery. The hybrids show a much larger benefit in stop and go driving than they do at constant highway speed driving when compared with liquid fuel propelled vehicles because of this energy capture by the "braking" system.