If your car jumped out of gear and rolled downhill to smash down your neighbor's mailbox, the damage liability in your renters insurance would pay to repair or replace the mailbox. (usinsuranceagents.com)
Being able to get the most out of a gear by shifting down or up at the best time is why race - car enthusiasts love standard transmissions. (automobilemag.com)
The car out of gear actually slows down faster (going down hill) then it does while in gear with no throttle. (mechanics.stackexchange.com)