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You could do-it-yourself. The theory is simple! You waste lots of energies
through frictions that can't be avoided in order to brake effectively. There is
a device that allows you to loosen up your brake pads a little bit (to get rid
of frictions), you can still brake on-time if you use this 3-state alternator,
it becomes a 5th brake as well as an alternator, and a frictionless alternator.
Not only you save fuel, your horse power increases as well. It takes only
7.5-15 months for it to pay for itself, while a hybrid takes 15.5 years, learn
more at:
http://www.nwcustomenergies.com/generators%20page3.html