B2N2 you are correct in
US gallons, whereas welkyboy talks of
Imperial gallons. In any case this could be cutting it a bit fine..... I learned to fly on the -161 and my old POH says 10 gal/hr @ 75% and 8.8 gal/hr @ 65% at best power cruise settings. You can bring this down, of course, but you'd have to make a very conscious effort to wring the last drop of Avgas out of it.... Fuel starvation does indeed sound plausible here.
PS: all my figures above are US gallons