Paul kgyy writes:

Probably the temperature. At 25" MP and 2520 rpm, I'd guess you would
be running about 78% power under standard temperature conditions
(15C?). But at -1C the denser air is giving you additional power
output so you're probably closer to 80%.

OK. That sounds like enough to account for the difference in speed
(?).

This is harder than most of us would be willing to run at 5000 ft.

My virtual funds are unlimited, but in real life, with a limited
budget, I'd be far more conservative.

Peak EGT at this power setting is also asking for engine detonation.

I haven't noticed anything, but I don't know if this is simulated (and
I'm not even sure that it occurs to a significant degree, as there
seems to be a lot of disagreement on that).

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