Model propane resale at an RV park or campground: delivered cost, resale price, seasonal gallons, and delivery/equipment fees — then read gross revenue, cost of goods, and margin per gallon.
Enter your delivered cost per gallon, the resale price per gallon charged to guests, and your seasonal volume. Gross margin = (resale price − cost) ÷ resale price, the layer before fixed delivery/equipment fees.
Season length is used to express per-month throughput; leave at your operating season.
Fixed propane-related overhead for the season. These pull against revenue after cost of goods, so they directly reduce the margin you actually keep.
Typical: a bulk propane supplier may pass a delivery fee per drop, and onsite tanks are sometimes leased seasonally.
Typical propane resale economics at RV parks and campgrounds, for context only.