I overlayed the 915is and 916is fuel efficiency charts on top of each other. The lower, blurrier lines are for the 916. It appears at typical cruise settings, the 916 is surprisingly 22-25% more fuel efficient. 

BSFC at 5500rpm and around 94kw/126hp:

915is: .312 kg/kwh (.515 lb/hp)

916is: .250 kg/kwh (.41 lb/hp)


The 916 fuel efficiency is in line with a typical modern engine. The 915 is not - it's so high I'm wondering if the chart is wrong. (Incidentally the horsepower labels are not correct on the chart in the Rotax operator's manual, I corrected them in this one).

10130_1_Screenshot 2023-11-07 at 12.10.26PM.png (You do not have access to download this file.)
You do not have permissions to reply to this topic.