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It's not really the miles that drain the battery, but just the ignition being on. In other words, you tend to get a certain number of hours on a battery charge, and you could spend those hours idling in traffic, or screaming down the freeway.
Dad lost an alternator in CA (I-5 south) in the van and we coasted into a rest stop. Someone was willing to put jumper cables on long enough to get enough of a charge that we made it to a parts store where my dad replaced the alternator.
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