Look fellas, after 9 pages of debate about various issues pertaining to the BMW vs. Jag topic, as for the horsepower-efficency-hp per liter arguments, it really comes down to what each car does with their respective power. We can argue all day long about different cars' horsepower ratings and hp/liter, but it doesn't change the fact that it doesn't mean anything unless it materializes into performance on the street or track. Look at the Infinit Q45 w/ its 340 hp V8 that blew away its competition on paper and was supposed to follow in performance. However, due to gearing issues, and other intangible factors, the Q simply didn't perform up to the level expected, leaving the likes of the BMW 540i with its "lowly" 282 hp 4.4L V8 still on top in terms of straight line acceleration, despite it's paper-disadvantage. You see, BMW has a renowned history for producing much-better than average performance numbers out of its cars who's horsepower and torque ratings don't seem to measure up. That's what it's really all about, and in this case, the 394 hp M5 has not disappointed in this area either with its consistent 4.6-4.8 second 0-60 times, and low 13 second 1/4 miles. The Jag, as tested by various magazines since its introduction, has failed to deliver as promised to some extent: for a car with more HP and torque, not to mention "better" transmission, and lighter overall weight, it hasn't been able to match the performance of the out-going 370 hp XJR sedan, at least in terms of a straight-line. This is not to say that it ultimately can't, or that Jaguar is simply an inferior car company, but let's not just talk numbers, because ultimately it's performance that matters. And in that respect, BMW is just getting it done more often that not.