best/easiest thing to do, is buy a deep cycle battery 100ah and plug it into your cigarette lighter port. charge it from home with a decent battery charger. get a 14v or 16volt battery and it will prevent the alternator from switching on. be careful with current though -maybe by a watts up meter.
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Nissan Leaf 24kwh. Average FE = 300mpg 3.6miles/kwh (@plug)
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