[trentgreene]

Hmm, I wonder if the increased resistance is overcome by the fact that ICEs can put out more power with colder denser oxygen rich air.

This is why performance cars sport cold air intakes. This is also why your car won’t hit its quoted 0-60 time in a warmer environment — those tests are normally performed or normalized to cold air conditions + 0% humidity. Just what counts as cold depends on manufacturer / reviewer.

Anecdotally, I track efficiency and drive consistent routes, and don’t notice a diff.

[bumby]

I wonder if the increased resistance is overcome by the fact that ICEs can put out more power with colder denser oxygen rich air.

Not likely, as an increase in air is going to be accompanied by a corresponding increase in fuel. Unless your fuel mapping is all messed up, it will give you more power, but not likely better fuel economy.