Among the gasoline versions of the 2012 BMW 7-Series, there's a relatively narrow spread in EPA ratings-that is, until you get to the more efficient 740 or ActivHybrid 7 models.
BMW's 6-cylinder 7-Series cars generate the best fuel economy, thanks to efficient engines and 8-speed automatics. They're EPA-rated at 17/25 mpg. These sedans can very comfortable carry four adults and their luggage, cross-country.
The ActiveHybrid 7 is the next most efficient model. Both its short- and long-wheelbase editions are rated at 17/24 mpg.
From there, fuel economy slides more perceptibly. In the V-8-powered, rear-drive, short-wheelbase 750i, gas mileage is set at 15/22 mpg. Adding a few inches to the wheelbase tips the scales heavier, which trims the numbers to 14/22 mpg in the 750Li.
Adding all-wheel drive to the stock V-8 sedans exacts its own penalty, with the 750i xDrive and 750Li xDrive both earning EPA ratings of 14/20 mpg.
The same 14/22 mpg rating is applied to both the short- and long-wheelbase twin-turbo Alpina B7, the high-performance edition of the 7-Series.
Finally, at the low end of expectations, the V-12-powered 760Li checks in at a not unrespectable 13/19 mpg.