On Thursday, September 18, 2014 9:18:38 AM UTC-4, Alexey Sharadkin wrote:
What airspeed and power setting are you using for the descent?



2000 rpm, 180 km\h

http://www.helium-group.com/wp-conte...POH-Tables.pdf says minimum fuel grade is 100/130. Discussion at http://www.pprune.org/private-flying...540-mogas.html suggests detonation and per-ignition problems with 92. Have you tried it with 100LL and compared how it runs?