When renting cars, ask about getting a hybrid car at the rental counter. Many chains like Hertz, National and Enterprise now have hybrid cars in their fleets at regular prices, which means you can save money on fuel expenses without paying a premium for the rental. Another bonus: Many hotels have reduced or free parking charges if you show up in a hybrid. Most Kimpton hotel properties offer free valet parking if you arrive in a hybrid. That can add up to hundreds of dollars in savings!