MPG hit for hot weather and AC use?

Yes. I can get a bit over 54mpg on a tank (500+ miles between fill-ups) when driving with mpg in mind and using absolute minimal AC. Going back to typical hammer down kind of driving (80+) during the daily commute and heavy AC use will reduce my mpg to around 42-43.

 

Over the range of temperatures I'm familiar with, the propulsion efficiency of the gasoline engine gets steadily better the higher the temperature. Assuming your trip mix and driving style have not changed, I think use of Air conditioning is causing MORE than all of your loss.

I live in Albuquerque, but find that by parking in the shade whenever possible, using my windows a lot, and just tolerating somewhat elevated temperatures I can and do avoid use of AC the great majority of the time. Now Phoenix...

 

completely normal, imo

 

i thought engines prefer a cold air intake

 

Overall, most automobiles get a considerably poorer fuel economy in colder weather. For the Feds take on reasons why you might review:

Fueleconomy.gov on cold weather effects

I don't know the overall shape of the curve, nor whether it actually turns over at some point (for reasons other than air conditioner operation).

[edited to add: my initial post was in error in implying that the widely known cold weather fuel economy loss was all due to degraded efficiency of the ICE itself. I, personally, have not seen plausible indication of degraded economy at higher temperatures above some inflection point, but we clearly see degraded economy from lower temperatures within the range annually experienced in Albuquerque.]