Minimum delivery gallons: why the truck won't bring you 40

Every winter, somebody with a quarter tank calls and asks for "just 50 gallons to get me through the week." And every winter, the office says no — not because they're difficult, but because the economics of rolling a tank truck don't survive a 50-gallon stop. Here's the real math, and how the minimum quietly shapes what you pay per gallon.

Why minimums exist

A delivery stop costs roughly the same whether the driver puts in 40 gallons or 240. The truck burns diesel getting to you. The driver walks your tank, drags the hose — sometimes 100 feet or more through snow — stands at the fill in January wind, checks the vent alarm, writes the ticket, and drives to the next stop. Add insurance, the truck itself, and the terminal run to reload, and a stop is a fixed chunk of money before a single gallon flows. Spread that cost over 40 gallons and the company loses money on the delivery; spread it over 150 and the route works. That's the whole reason minimums exist. They're not a punishment for small houses — they're the route math showing.

What's typical

Every company sets its own numbers, and they change, but these are the patterns you'll see across Ohio:

• Heating oil: a minimum drop of 100–150 gallons is typical for a standard residential delivery. Some companies set it at 100, some at 150, some price it as a minimum dollar amount instead.
• Propane: minimums are usually framed differently — often a minimum number of gallons, a minimum fill percentage, or simply "we fill the tank" on automatic routes. Because a propane tank is only ever filled to about 80% (room for the gas to expand), a "fill" on a 250-gallon tank that's down to 30% means roughly 125 gallons going in.
• Emergency and off-route deliveries sometimes come with a lower gallon minimum but a delivery fee on top — you're paying for the special trip the minimum was designed to avoid.

The minimum changes your real price

Many companies run tiered pricing: the per-gallon price for a small drop is higher than for a full fill, because that fixed stop cost is being divided by fewer gallons. So the customer who orders 100 gallons at a time, four times a winter, often pays meaningfully more per gallon — plus more delivery or hazmat-style fees, where they apply — than the neighbor who fills a 275-gallon tank twice. If your company tiers its prices, the cheapest gallon you buy all winter is usually the one that tops off a nearly empty big tank.

How to work with the minimum instead of against it

• Let the tank get low before you call — but not empty. On a standard 275-gallon oil tank, calling at a quarter tank leaves room for a full minimum drop plus a safety margin. See how to read your gauge.
• Ask about the price break. "What's the per-gallon price at 100 versus a fill?" is a fair question, and the answer tells you how the company really prices.
• Seasonal tip: a full tank in the fall means your first mid-winter delivery starts from a better position — and you're not the person begging for an emergency minimum exception during the coldest week of the year, when every route is booked solid.
• If money is the reason for small orders, ask about a budget plan instead. Spreading the cost monthly is usually a better answer than paying small-drop prices all winter.