Should I sell my paid off car to invest the cash?

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

1. 1
   keeping the current paid-off car and selling it later for a lower price
2. 2
   putting the cash from selling the car into a high yield savings account instead of stocks
3. 3
   Keep the paid-off car, maintain it well, and drive it for many years to avoid transaction costs and extra tax bills
4. 4
   Cut expenses elsewhere in the budget to free up cash for student loan payments instead of trading down
5. 5
   Pretend the car payment still exists and use the extra funds to build an emergency fund and make principal payments on student loans
6. 6
   Storing the car in a garage or commercial storage space while paying a friend or relative to drive it periodically
7. 7
   Selling the car, clearing the remaining loan balance, and purchasing a replacement vehicle upon return
8. 8
   putting more monthly payments toward paying off the truck
9. 9
   buying a reliable vehicle, paying it off quickly, and driving it forever

In their words

Unedited, most upvoted first, each linked to the thread it came from.