i use my generator and roof top A/C as needed
it does not affect engine motor directly
IF you dash a/c has too work less hard, then maybe there is a slight difference
in engine power
as far as gas milage for the drive engine
it has NO effect
but since it does use fuel for the genny
your next fill up means more fuel from the pump to the tank
but this is NOT engine fuel mileage, this is additional overhead fuel use by the genny for 'personal comfort'
we get people on here, saying i used my genny for the roof top A/C and mileage went down,
NO your engine mileage did not change
this is like saying the water bill to fill your swimming pool went up, because you has a pool party and all your friends drank too much beer and keep using the toilet
I can explain it to you.
But I Can Not understand it for you !
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1997 F53 Bounder 36s