does ram air affect economy?

Staying out of the arguement of the op's question, but one thing I do know is both of our vehicles (EFI, 1 diesel & 1 gas) get better fuel mileage here in the cooler climate than they did down in AZ. And yes, that is with both the a/c on & off. The Exploder was getting a touch under 20 in AZ. In the Pacific North West it is getting almost 21......