As one PPRuNer signs off, after you make a good landing you can use the airplane again.
While the local pilot community may well have other insights, I can think of two possibilities:
- Carburetor Icing: You would need to know the temperature and dewpoint, especially at altitude and check that against the chart
- Non-Standard Temperature Drop: There may well have been a substantial drop in temperature in the first few hundred feet such that you needed a richer mixture to avoid detonation. A mild detonation condition would have cost substantial power loss. If you have overleaned a bit, you will see a rise in oil temperature
Somehow I doubt that in the excitement you had a look at the OAT or oil temperature -- don't know if I would remember that either when making a good forced landing is the top priority and there is precious little time to spare problem solving
