The ideal solution is a deep cycle battery and a charger. The deep cycle won't be hurt by draining it deeply. If it's on a charger at night, you'll know it's always fully charged at the start of the day, and you should be good for a while.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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