I decided to buy a plane to travel and build time. I was shopping for a Cessna 150, but I found an Grumman AA1C with an O-320 and bought that instead. One of the things I was looking forward to was building time 5gph in the Cessna, I recently flipped through a manual for an AA1B and noticed that it shows a power setting for cruising at 52% power on 4.5 gph. In theory, my O-320 should get similar fuel burn at similar power outputs (approx. 56hp), but it would require throttling back to 37% power and most performance charts do not go below 50% power. Are there any risks to throttling that far back in cruise? Is there anything I should watch out for if I were to try this?