I can't say for sure which is the most efficient, since I can't tell much difference either way. I can tell you for absolute surety that the most comfortable is to run the generator and the roof airs. At our age, comfort is more important than a few cents per mile. If it's hot enough, I'll run both the roof airs and the dash. The best I can figure, the generator is using just about the 1/2 gallon per hour that Onan says it will use.
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2017 Phaeton 40IH XSH Maroon Coral - Power Glide Chassis with IFS
Previous '15 Tiffin Allegro RED 38QRA and '06 Itasca Sunrise 35A
'16 Jeep JKU Wrangler Sahara or '08 Honda Goldwing
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