Bill - Thanks for sharing the flight data for your RV- 6.  I have not performed a similar test - I have only written down all engine and speed data as I fly.   I have one recent data point that is close to your test data at 7500 ft.  RV-7A, Renesis and RD-1C, 88/76 Catto prop, 195 # pilot and 240 # pass., 30 # baggage and 18 gal. fuel. Flying at 7500 ft altitude, 56 deg OAT. -- 6000 rpm, approx.10.15 gph, 150 mph indicated, 170 TAS.  Oil temp 177 deg. F. Water 160 deg. F.

I'll use your graphs and add data points as I can in the future.  I have not tried WOT at 3000 ft. yet.
I hoope to be flying more now that Spring is just around the corner!

Dennis Haverlah