I've done a lot of extended business trips. They ranged from 2 weeks to 2 years. If you liked the vehicle and planned on keeping it many years - or to have one like it - then it's cheaper to keep it.

You insurer will allow you to stop and restart your insurance, or even do a special rate for coverage on a parked vehicle (inside a home garage it's covered by home insurance). DO NOT let anyone drive it if you tell your insurance company it's not being driven...

Change the oil, wax it, put a battery tender on it and turn off the insurance. You'd lose more to sell it and then later buy another.

Where are you going, what will you be using for transportation? I've shipped vehicles between North/South America, and Europe. My company would pay for a rental car - or pay mileage. For longer trips they paid for or subsidised the cost of shipping a vehicle.

If you do decide to sell it - then list it on e-Bay for exposure. But being same year and high miles - you're going to take a bath on it. Especially now that gas is going back down...