The O-200 is a fine engine if well cared for, but low cylinder compression can be a problem, and it will reduce power output. I presuppose that the engine maintence is adequate. There are also wing adjustment cams, whose position can slightly affect cruise speed. It could be that the prop on the 150 is pitched to a very low blade angle, for better climb. The mixture distribution is more even at 2450+-, than at engine speeds faster or slower.ħ0kts does sound a little slow though. 2400-2500 will get you better results, particularly if you are leaning. In a 150, 2200 RPM is on the slow side for cruise power. ![]() The 152 does have a few more horsepower than the 150, and often a somewhat more coarse pitch propeller, so a little faster cruise can be expected.
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