Using BSFC figures, can you point me to any motor vehicle engines that are 30% more efficient than an aircraft engine?
27/09 - I was actually referring to a 30% fuel efficiency gain over the last 60 years in automotive engines - which has been driven by legislation, not by any effort on the part of auto manufacturers.
The legislation was more than likely driven by the understanding that the corporate inertia to introduce improved engine efficiency was unlikely to be overcome without legislation, when you have auto manufacturers and oil companies sharing directors on the company boards - as is, and has long been, the case.