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and many lead acid batteries.
... some people spend a few hundred bucks on a carbon fiber hood so they can reduce the weight of their car by 5 lbs. This has a lot more bang for the buck.
Who knows how much fuel can be saved over the life of the vehicle. We do know that lead acid batteries are extremely inefficient at accepting a charge when they are near full, which is all the time. Perhaps they are 50% or less efficient, and we know the alternator is extremely inefficient.
Lithium ion batteries are very efficient accepting a charge even when nearly full.
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