I know a lot of the 04-08s had problems eating batteries! Maybe your 09 is doing the same thing. My 08' has 15k miles on it and has had 5 batteries... Now I am running an optima yellow top and about to wire another one in. At least now if it is dead for a long time I can just deep cycle it and the battery is good to go. The truck is getting a new engine so maybe that will take care of the problem... well see.
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