I used to feel that way too. 10-12 hr workdays. Seems like you don't have enough time for them but for me knowing they were within my reach was more than enough to keep them. I always found time on the weekends even if it's just an hour drive one at a time when I had the time. Unless you're really good at investing 15k in the savings won't get you much more than keeping the car. Keep it unless you're in need of the cash. I for one likes to peek in my garage just to smile knowing they are waiting for me.
