[RedDevil]

Another A run this morning (no water bottle).
Slight drizzle, no wind, same temperature as before.
I had parked nose out and had only one stop, didn't even come to a standstill.
The blue Cold Engine indicator stayed on to well beyond school...

Crappadeedoodah. There goes my theory.
Heating the intake can prolong the warmup time quite some.
Not heating it can do the same.
I had a clean run to work, nice draft and all. Economy was the same as yesterday, both after a few miles and at the end of my commute.

There was less wind. Yet, not much in there.
The benefit of a WAI on startup (under these conditions) is minimal, if it exists at all.

All I can say is that the warmup time seems more time related than distance related; the more stops the earlier (distance wise) the light goes out.
I'll time it next time round, see if that is indeed more constant.