2012 BMW 640i Coupe - Car and Driver
The company fits its regular-production models with a naturally aspirated inline-six, a turbocharged inline-six, or a twin-turbocharged V-8. (Starting this year, the naturally aspirated six is being replaced by a turbocharged four-cylinder, and... With those three basic packages, BMW powers the 1-, 3-, 5-, 6-, and 7-series, the X3, X5, and X6, and the Z4. We rarely complain about any pairing of powerplant and vehicle. The BMW 6-series, freshly redesigned for 2012, shares most of its underpinnings with the 5- and 7-series sedans, both of which are available with a turbocharged inline-six. Thanks to the tall gear ratios at the top of its eight-speed automatic transmission, the 640 delivers an EPA-estimated 31 mpg on the highway. That gives this two-ton coupe the highest highway fuel economy of any BMW, aside from the 528i and Z4 sDrive28i, which use the firm’s new four-cylinder. Interestingly, 31 mpg is also 6 mpg better than that of the six-cylinder 740i. The 6’s city figure is 21, compared with 17 for the 7. Thank the 640’s two extra gear ratios—the 740i still has just six—and its newer, single-turbo engine. Turbocharged BMW six-cylinders are the violin-virtuoso, football-captain, Harvard Law–grad, charity presidents of the engine world. Source: www.caranddriver.com
