Mark, I am just not so sure that I can answer your post correctly. Regarding injection, let's not forget that it was Bosch that designed the various systems and the manufacturers would use whatever Bosch would place at their disposal. Back in the '70s, emissions was a dirty word, and K-Jet was formulated and introduced as cutting on emissions. Engines were supposed to run much cleaner. So K-Jet and KE lasted until the early '90s.
Since then, of course, computer controlled injection has taken over, and engine management, injection and sensors have taken fuel injection to an entirely more advanced and efficient level.
Regarding suspension with its variation from air to hydraulics and back to air, it pays to remember that Mercedes, with its own and unique 6.9 system - oh, and we must include Citroen, were just about the only manufacturers to offer a hydraulic system. Air suspension is now offered only on high price vehicles such as Mercedes and Range Rover (any others ?), but let us not forget that the McLaren MP4C (?) offers a hydraulic system that is much reminiscent of the old 6.9 arrangement. There is a lengthy and thorough appraisal of the McLaren system somewhere on our website. Regards Styria
N.B. Okay, found it. Introduced by none other than Mark. Have a careful read of how the system works. Marvellous.
http://www.topklasse.org/forums/showthread.php?t=2875&highlight=McLaren