Although there’s a myriad of good reasons to avoid a V12 engine when buying a luxury barge, let’s face it — you want all twelve cylinders. Thanks to the way internal combustion works, they have a silky-smoothness that just can’t be matched by smaller power plants. However, because of the price premium they command, combined with the recent importance of fuel efficiency, the V12’s popularity has been dwindling. As a result, BMW says they’re not certain the next-generation 7-Series will have a 12-cylinder option.