tailtwiser, here are some RPM figures you might be interest in.

Saito91 15/16 bryon fuel. Here in Memphis, TN. Temps were in mid 60's. These were taken last week. Motor is broke in.

14x4W APC 10,800(Peak) I fly it at 10,400

15x4W APC 9,100 (Peak) I fly it at 8,800

I know the Saito 91 and 100 are 2 differant motors but, Maybe this will help.

I have read that the 100 will give you about 400 more RPM than the 91.

Hopes this helps.