Today flew total of 4 hours, running hard at full throttle and 2700 rpm, >80% power. Covered the corners of my approved box for a total of 520 NM. Remained mainly at 5500 due to cloud layer and strong winds from the southwest. 8PP performed flawlessly. Oil consumption rate has been steadily declining. Oil Consumption First flight (1.5 hrs)...................0.67 qts/hr Second flight (1.5 hrs)..............0.33 qts/hr Third flight (4.0 hrs)..................0.25 qts/hr CHTs were well controlled and kept below 400F by adjusting the mixture. Fuel consumption was about 17 gal/hr for filtered air vs 16 gal/hr vs ram air at full power.