BMW

2013 BMW ActiveHybrid 740 Li
Price: $85,195
Gas mileage (city/highway; combined mpg): 22/30; 25
Efficiency-cost rating: 0.29

With an EPA-estimated 25 combined mpg, which is impressive for a large, long car, the 2013 BMW ActiveHybrid 740 Li has an efficiency-cost rating of 0.29. It's low for any hybrid, but it's the best of the full-size luxury sedans, beating the Porsche Panamera S Hybrid (0.26), Mercedes-Benz S400 Hybrid (0.23) and preposterous Lexus LS 600h (0.17). However, the gas-only BMW 740's ECR is better at 0.30 with an estimated 22 mpg combined for $74,495. The Mercedes S400 is the only hybrid luxury car that beats its gas-only version, by a slim 0.03 in efficiency-cost.