$/kwh is still a lot higher for lithium than for lead acid, so lithium 12Vs aren't really a practical idea unless you have a hybrid battery that most of the accessories run off of.
Therefore for the same price the lithium battery will have a lower capacity than the lead acid battery, which will mean less ability to engine off coast in your manual transmission econobox, which will handicap maximim MPG.
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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