I have seen several studies in motorhome mags that say generator option is not a good choice - unfortunately I can't come up with them. But, I doubt if you could find the mpg difference ,AC or not, in a motorhome. My Vegas is very comfortable in very hot weather running only cab air - have never considered turning on the roof air ( my previous 40 ft diesel pusher was a different story ...). I also know- in a modern car, running the AC is actually more economical than driving with the windows open ( aero drag increase). But not really on topic to this conversation....
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