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Originally I was planning lead battery pack for my conversion because of relatively cheap price. After I made a excel file that roughly calculates this "economy" thing I turned my head and went lithium way. I included current price of electricity and gasoline, expected battery life, average fuel/electricity consumption and total price of batteries for given size pack in these calculations. I also noted kilometers driven each year. Lead and gasoline were pretty much in the same level depending on price of batteries and gasoline. But if lithium cells lasted anywhere over 1000 cycles they won this comparison. If you drive a lot lithium pack pays itself back faster. Might take years though, especially if you don't drive much.
I believe what he says. Cost/mile can be higher but it depends from at least those factors I mentioned.
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