BMW's 480 horsepower X6 ActiveHybrid has been rated by the EPA and the results are in, 17 city and 19 highway for a combined fuel economy of 18 mpg. The X6 ActiveHybrid combines the xdrive50i's twin-turbo V8 with electric motors to improve fuel economy. The nonhybrid X6 xdrive50i has EPA ratings of 13 city and 18 highway, and 15 combined. This means that the hybrid powertrain increases city fuel economy by nearly 31% while only giving a 5% boost on the highway. Overall drivers should expect a 20% improvement in fuel economy compared to the regular V8. A better example of the fuel economy improvement is the fact that the ActiveHybrid X6 has a higher combined fuel economy rating than the six cylinder X6 xdrive30i. However, BMW's focus on performance is evident as the ActiveHybrid's improvement in fuel economy is smaller than that seen by General Motor's SUVs which feature similar hybrid technology. Both companies took part in the Global Hybrid Cooperation. Only time will tell if BMW's focus on extra performance will pay off.
BMW X6 xdrive50i, 400 horsepower: 13/18 (15 combined)
BMW X6 ActiveHybrid, 480 horsepower: 17/19 (18 combined) 20% improvement
Cadillac Escalade 2WD, 403 horsepower: 14/20 (16 combined)
Cadillac Escalade 2 WD Hybrid, 332 horsepower: 21/22 (22) 37.5% improvement
Chevrolet Tahoe 4 WD, 320 horsepoer, 15/21 (17)
Chevrolet Tahoe 4WD Hybrid, 332 horsepower: 21/22 (22) 29% improvement
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