I can't hang a number on it as I don't have that kind of experience.

But I remember seeing a someone else's test a little while back, entire intake and carb was iced during a dyno test.
Temp guns on the manifold showed it heated back up to where it was almost instantly,
as did the air temperature, But the carb and the fuel did not.
It picked up and they pointed to cold fuel, given all else.

Seems to agree.