RE: prop size for 180 4s.
Well that works out to needing at LEAST a 36oz tank to attempt to get 10 minutes of flight out of a BGX.
Or roughly 3.2 flights out of a gallon of fuel.
Yup it's NOT cheap and it will guzzle fuel, but it is not quite as bad as I thought given how the BGX is made out to be in terms of fuel consumption....