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What is the cheapest fuel for a generator?

Author

Ethan Hayes

Published Jan 16, 2026

Diesel

  • Diesel is a very easy fuel source to obtain.
  • Diesel generators are the most suitable for long-term use.
  • Diesel generators are the least expensive to operate and maintain over time.
  • Diesel is the least flammable of the four major fuel sources and can therefore be stored on site for quick and easy refueling.

What is the most efficient fuel for a generator?

Diesel is the most efficient of generator fuels, offering 138,700 BTUs per gallon of fuel (enough to heat an average sized room for 6 to 12 hours).

Is it cheaper to run a generator on propane or gas?

Propane generators are less efficient than gas generators, producing fewer BTUs per gallon of fuel.

Is it cheaper to run a generator on gasoline or natural gas?

Natural gas generators are more efficient and cost-effective than other generators running on fossil fuels. According to the U.S. Energy Information Administration, natural gas generators accounted for 43% of the U.S. electricity generation capacity in 2019.

Which is cheaper to run diesel or propane generator?

It sounds little, but yes, 80% of the energy of your fuel is lost. So, a more realistic price of what you are going to pay for your kWh of electricity is 5 times higher (around 44c per kWh for propane and 36c per kWh for diesel). Hence, we can estimate that diesel generators are 22% cheaper to run.

Is it cheaper to run a generator on propane or gas?

How long will a 20 lb propane tank run a generator?

A 20-pound propane tank will run a generator for a total of about five hours. A propane tank of this size can usually carry around 4.6 gallons of propane. So, depending on the total weight of your load of propane, the operating times may vary.

Does a generator run longer on propane or gas?

Another drawback to propane fuel is that you'll run through it faster than you will gas or electric. While propane generally costs less than diesel or gasoline, it has a lower energy density.

Is a gas generator cheaper than electricity?

As illustrated, even when a range of electric prices are considered, natural gas prices are consistently two to three times lower than electric prices. In fact, when all charges are considered, for a $0.06 per kilowatt hour (kWh) electricity rate to be competitive, natural gas would have to cost $1.77 per therm.

How much does it cost to run a generator per day?

A standard 5-kilowatt generator will typically consume about 0.75 gallons per hour. As of July 2018, the average price for gasoline is $2.89 a gallon in the United States. If you ran the portable generator for a day, that would consume about 18 gallons, meaning the cost to run the generator would be around $52 a day.

How much fuel does a generator use per day?

With a five-kilowatt generator consuming 0.75 gallons per hour, you'll consume up to 18 gallons of gas per day. However, it's important to note that these calculations are for essential survival appliances. With these calculations, you can expect to pay up to $53 per day to run a generator for essentials.

How big of a propane tank do I need for a generator?

For most home usages we recommend either a 120 gallon tank for short outages (1-2 days) or a 500 gallon tank for more extended time periods (8-10 days). Here are more exact estimates based on the size of your generator and assuming an average 50% load on the generator during the outage.

Are generators quieter with propane?

Propane is an affordable fuel, typically costing 30-40% less than other fuel types. Propane also burns much cleaner than gasoline or diesel, reducing a company's carbon footprint. On top of that, propane generators are quiet, so there is no worry of disturbing neighbors when working in a residential area.

Which is better propane or diesel generator?

And for those concerned with the environmental effects, a propane generator is hands down the way to go. Propane is one of the cleanest burning fuels in use. It produces fewer particulates and less greenhouse gas per gallon than either gasoline or diesel.

How can I make my generator consume less fuel?

Reduce Your Generator's Fuel Consumption

  1. Only run the necessary appliances. ...
  2. Service your generator on time. ...
  3. Do not run your generator on less than 50% Load. ...
  4. Remove carbon deposits on time. ...
  5. Service on time and use genuine replacement parts. ...
  6. Use alternative power sources. ...
  7. Choose a high-quality set. ...
  8. Never overload your generator.

Does a generator use more gas with more things plugged in?

If you don't exceed your generator's capability, more load means more power and more fuel.

Is propane better than gas?

The more efficient the fuel is, the less you'll use, which plays a role in overall cost. And, overall, propane is the more efficient fuel. One cubic foot of propane equals 2,516 BTUs, while one cubic foot of natural gas equals 1,030 BTUs. That means, propane is more than twice the energy of natural gas.

Are generators worth it?

Whole house generators are expensive, but installing one can be worth it if you work from home, experience frequent or prolonged power outages, store lots of cold food, or live in a climate where heating or cooling is essential. Generators can run for weeks with enough fuel and proper maintenance.

How much gas does a 3500 watt generator use?

Using gasoline, the 224cc Champion engine produces 4375 starting watts and 3500 running watts, and will run for 9 hours at 50% load when the 3.4-gallon fuel tank is full. It produces 3950 starting watts and 3150 running watts, and will run for 10.5 hours at 50% load when using a 20-pound propane tank.

Is it cheaper to generate your own electricity?

Cost-effective: Generating your own electricity may be the cheaper option if your property has access to renewable energy resources such as solar, wind, or running water. Instead of paying exorbitant rates for getting electricity from the grid, this is cost-effective in the long run.

Can you run a house on a generator full time?

On average, a standby generator can run for up to 3,000 hours powering a medium-sized home, though it is recommended you do not run a generator for longer than 500 hours continuously. Two factors affect the amount of time a whole house generator can continue to run: Generator type. Fuel source.

How much does it cost to run a generator on natural gas?

Running a generator on natural gas will cost you anywhere from $0.02 to $2.41 per hour (1,000W 25% load generator to 30,000W 100% load, respectively). It will consume anywhere from 1.86 ft3 to 222.90 ft3 of natural gas per hour.

Is it okay to leave a generator running all night?

Carbon Monoxide Hazard

The most serious risk of running a generator all night is carbon monoxide poisoning. Because of its nature, a portable generator emits carbon monoxide when its engine is turned on.

What are the disadvantages of propane?

The biggest disadvantage to a propane heating system is keeping up with tank maintenance – or not. If you own the tank, you're responsible for regular inspections, and you have to fix the problem if there's leaks or corrosion. You might even eventually have to replace the tank.

Can you run a generator 24 7?

Most gas-powered generators are going to stay running for anywhere from a few hours to up to 24 hours. However, some portable gas-powered generators have a large fuel tank. These generators are good enough to last for a few days.