[NeilBlanchard]

While power plant efficiency is a very important factor to the overall vehicle's efficiency, there are lots of ways to improve the rolling chassis, as well.

Rolling efficiency is the most basic function of any vehicle; however it may be powered. This involves:

* Tires, wheels, wheel bearings, suspension, wheel alignment (loaded and in motion).

* Ride height and attitude -- both of these are critical to good aerodynamic drag, and we should not leave them to chance.

* All aspects of aerodynamics: overall shape and size, specific details, ventilation of the passenger compartment, motor/drivetrain cooling/temperature control. By using good passive air management, we can both improve the air flow around and through the vehicle; and avoid needing a power input to actively solve these requirements.

* Weight and friction of all moving parts (if you can avoid power steering and power brakes, this reduces the losses of operating the vehicle).

+ Temperature stability affects a lot of things: the people, and the drivetrain in particular. Learning from buildings, we should use insulation and low-e glazing to help stabilize the temperatures.

+ Braking should be regenerative: either electrical whenever possible, or, we should use hydraulic motors and a small accumulator; instead of friction brakes which produce waste heat.

+ Especially if the brakes are regenerative hydraulic, then the suspension should also be regenerative; and use the shock pistons to also pressurize the accumulator. If possible, the entire suspension springing should be hydraulic, I think. Because flexing springs also produce waste heat. Alternatively, the suspension could be electromagnetic.

Can you add to this list of improvements, please?