BMW is expected to be adding a diesel version of the flagship 7 Series sedan as early at the 2013 model year.?? It will likely wear a 735d or 740d badge.? According to a report by Car and Driver magazine, the engine will probably be a 3.0-liter in-line six-cylinder rated at somewhere between 265 and 308 horsepower with torque numbers in the 424- to 465-lb.ft. range.? Fuel economy is expected to be as good as 42 mpg.? In Europe BMW will be offering a 750d version for 2013, which is expected to have 376 hp and 546-lb.ft. of torque.? Unfortunately, that car will likely not be coming to North America.