Flywheel P&G
 

Green Car Congress: NASA Glenn develops automated flywheel pulse-and-glide system; improving fuel economy up to 40-100%

I've been trying to promote this for years. High efficiency capacitive energy storage does not require a lot of storage capacity to increase efficiency significantly.

regards
Mech

Ford has one too, US Patent Application Nº 20130226420: Vehicle Speed Control Apparatus And Method

The NASA Glenn Research Center flywheel PnG system delivers power and energy between 8-20 kilowatts (kW) and 2-3.5 kilowatt hours (kWh); system lifetime is approximately 10 years.

I was informed that the link goes to the comments on the topic in my first post. Lets see if this goes directly to the article, but I think if you just scroll upwards it will do the same.

Green Car Congress: NASA Glenn develops automated flywheel pulse-and-glide system; improving fuel economy up to 40-100%

regards
Mech

A friend of mine was brainstorming ideas for energy storage in a bicycle and thought of a flywheel, but I hadn't thought of using one to even out speed during P&G. You could also 'spin up' the flywheel using grid electricity before you leave I bet.