battery goes flat - '06

anyone else having this prob?.........the battery will go dead in my '06 'stang within 3 weeks parked in the garage........a lot less if I turn
the alarm on (factory).
dealer sez they've tested everything and no unusual drain - all normal - I should just drive it more. great. I've got a number of cars and the older ones can sit all winter without going dead,.....looks like the 'stang would go dead in a week if I left it at the airport with the alarm on, etc. crazy!
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