G'day

Three and a half tanks of fuel is not a great deal. I think your club mates are on the right track, it is just not run in yet.

I would set your idle on the high side so it keeps running AND I would use a lower pitch prop so that it will still slow down to land. So if you are using a 10 x 6 which would be about normal for a plain bearing 40, try a 10 x 5 or 10 .5 x 5 and it should be fine while it is idling high.

One other thing to check, try tuning it with the tank about 1/4 full. It could be that it is just leaning out in flight and is a bit too lean at the end of the flight as the tank becomes empty.

Let us know how you go.

Mike in Oz