Written on: May 11, 2026
One way to avoid heating oil run-outs is to monitor your tank gauge. But if you’re signed up for automatic delivery—which is the best way to avoid needing an emergency fill-up—you may wonder why you need to pay attention to your heating oil tank gauge at all. In fact, keeping an eye on how you’re using fuel can help you save money and even identify issues that are affecting your usage and possibly driving up your heating oil costs.
We bet that’s got your attention. Here’s what you need to know.
Even if you are signed up for automatic delivery service, knowing how to read your oil tank gauge is a good skill to have. It’s as easy as reading the gas gauge on your car.
The heating oil tank gauge is a clear glass or plastic cube marked F, ¾, ½, ¼, with a red indicator that shows the amount of fuel left in your tank. If the marker is at the bottom of the gauge or not visible at all, your tank may be empty.
It’s important to know that when we “fill” your tank, we don’t fill it to its total capacity. The reason is safety: It’s important to leave space in the tank for the oil to expand as it warms up. There also needs to be room for air in the tank, as well as debris and sludge that settles at the bottom of the tank.
What that means for you is that a 275-gallon tank, for example, is usually filled to about 225 gallons. So if the gauge on your 275-gallon tank reads half full, you actually have about 110 gallons left. That’s important if you prefer to call for your heating oil deliveries.
We strongly recommend calling for a delivery when the gauge on your heating oil tank is at about 25% full. That ensures we have time to dispatch your delivery before you run out of fuel. If you forget, and order when your tank is empty or almost empty, an emergency fill-up will cost extra. Plus, you run the risk of losing your heat—which can lead to frozen pipes and more expensive repairs.
You need to keep an eye on your tank gauge—and also be aware of the weather. When we have a stretch of extreme cold, like we saw a few times this winter, you’ll use more heating oil than you would under normal conditions—and need a fill-up sooner than normal.
When you know how much your tank holds, and how long your oil usually lasts before you need a delivery, you can spot changes that can help you be more efficient. When you burn through your fuel faster than normal—and the weather hasn’t been particularly cold—it can point to other reasons you’ve used more fuel. For example, more people at home during the day or during the week may mean the thermostat isn’t turned down during the day as much as it might be if everyone were out.
Other things that can cause your boiler or furnace to work harder—and use more oil—are things like dirty filters and gunked up parts. It’s a good reason to keep up with maintenance.
Automatic delivery is exactly what it sounds like: We automatically deliver heating oil when you need it. We use a proven system based on your typical usage and the weather to know when you will need a heating oil delivery. If there’s been a stretch of serious cold, or if there’s a big storm in the forecast, we adjust our delivery schedule to make sure none of our customers run out of heating oil.
It’s a free service that we offer our customers. It makes your life easier, and helps us too: We can plan delivery routes efficiently, which helps us keep our costs down and our trucks on time.
We understand you’ve got a lot of choices when it comes to heating oil dealers. There’s a reason so many of your neighbors in Litchfield County choose Marandola. We’ve got you covered with convenient services (like automatic delivery—but so much more!) that give you real value, not just a cheap price per gallon.
Contact us today to learn more and become a customer.