LP is nice IF you don't drycamp/boondock in hot weather
our previous RV was a 34ft DP with 6200w LP onan
in hot weather we refilled the 27 gallon LP tank, every (3) days
i would say we averaged about 8 gallons of propane per day in 100* weather
the current RV is a 36ft Gas and using approx the same amount of fuel per day for A/C , battery charging etc.
this is with a 10 to 12 hrs of run time per day with A/C, MW cooking, battery charging
the difference being, the 75 gallon Gasoline tank, gives more days of use before going for more fuel