dougies, you idgit. That is NOT the manufacturer's spec sheet, but rather some
clown's ramblings. This time go check the spec sheets that engine
manufacturers put out.

A good explanation is at

http://www.prime-mover.org/Engines/GArticles/bsfc.html

which BTW also quotes some figures for various types of engines... which
BTW don't agree with your figures, surprise surprise.

Fresh Breezes- Doug King