Originally Posted by
lucille
I stand corrected. OK, not twice. But significantly better. The only figure I can find is for a 2007 BMW diesel of 198 g/KWh. VW have since improved their efficiency. cy. You only have to look at their automotive consumptions to get an intuitive feel.
https://en.m.wikipedia.org/wiki/Brak...el_consumption
Ps.. I tried to look for IO-550 BSFC numbers.. do you have a link?
I googled "IO-550 SFC" and this came up on the first line:
https://summitaviationmfg.com/wp-con...-TI_Engine.pdf
It quotes a 0.385 lb/hp.h which is 234g/kW.h although it may have got the best economy and best power figures switched on page 3. These numbers are, however, typical of what I've seen quoted around the traps for many years. As far as BMW diesels doing 198g/kW.h that's a very best-point number and there would be some celebration in the engineering office about it. Some of the old VW PD diesels are sub-200 but it's quite difficult to do and even more difficult to spread out across a useable area. The fuel consumption you see in the day-to-day use of a car is waaaay worse than these numbers, especially on a gasoline engine. If you could cruise at a steady 100km/h at 200g/kWh in a modern car you'd be seeing 3.5-3.8L/100km That's not typical of anything I know of.