Mine is at my second home and has been sitting in the garage unused for about a month.

It probably has at least two months until I'm going to be out there again. I'm not above flying out there for a day to rip around in it and then come back if I feel the need to.

Do you think my battery will be dead after 90 days?

Anything else I need to worry about?

I know these cars sit forever on dealer lots but the next time I head out there will likely be to fire the car up and hit the highway for the 6 hour drive home in late winter / early spring.

For starters, save your battery and get one of these:

http://www.amazon.com/s/?ie=UTF8&key..._sl_2sc3ptjn_e

While you're at it don't forget:

http://www.amazon.com/STA-BIL-22214-...3413957&sr=8-1

Longest I let it sit for was around 2 weeks.
If the car has been sitting for months on end then the tires will eventually get flat spots.
I'd also disconnect the battery too.

5-6 months every winter. Heated garage last year, no battery tender, fired right up. This year it's on the driveway in the snow and cold.

12 hours at the most.

Well that's reassuring. Thanks!

I have to ask though... If the c63 gets the driveway treatment what's in the garage??

Bikes and we keep it open to work on any vehicles in the winter that may need some fixing. A little snow and cold wont hurt the old girl.

Shes in there now standing on jack stands on all 4 corners, getting LT headers tomorrow. Wahooo

Trickle charger, fuel stabilizer, and some some tire pads to park it on to avoid flat spots in the tires. http://www.autogeek.net/tire-supports.html

A bit over 3 months, and no issues.

About 5 days or so. I take her out on the weekends if the weather is good. If its bad then it could be 2 weeks.

Winter is here though, if it snows it wont come out for a while.