If you can make some extra money by renting your home to a stranger (Airbnb), why wouldn’t you rent your car when you are not using it? Thousands of car owners across Europe today use peer-to-peer rental sites to make their car ownership more affordable. The services, including Paris-based Drivy and Copenhagen-based GoMore, are growing in popularity. Car owners post their vehicles on a website, and users, after their driver’s licenses are verified, ask to rent them. The sites take a cut of each transaction. They work with such partners as Allianz to provide roadside assistance and insurance for damage, theft, and liability. Owners set rates, from about €15 to €100 a day, depending on the type of vehicle. Renters pay for fuel.