How Much Fuel Does A Generator Use?

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A portable gasoline generator typically uses around 0.13 gallons to 0.44 gallons of fuel per hour at 25% load.

Propane standby generators typically use around 1 to 2 gallons of fuel of propane an hour at 50% load.

You can find other fuel consumption rates for different fuel types below.

Keep in mind that these numbers are just rough general trends. How much fuel your generator will actually use depends a lot on its size, brand, design, and type.

How much gas does a generator use?

According to my research of hundreds of gas generators, a generator will typically use around 0.13 gallons to 0.44 gallons of gas per hour at 25% load.

How many watts your generator produces and whether or not it is an inverter generator will influence the actual amounts of gasoline used a lot.

How much gasoline does a generator use per hour?

A generator typically uses around 0.13 gallons to 0.44 gallons of gasoline per hour at 25% load.

This means a generator will use around 0.49 liters to 1.67 liters per hour at 25% load too.

The actual numbers will depend a lot on the size and brand of the specific portable generator.

2500 peak watt generators tend to use around 0.08 gallons to 0.1 gallons of gasoline an hour at 25% load.

On the other hand, there are 15,000 peak watt generators that use 0.59 gallons of gasoline an hour at 25% load.

This is normal since one generator will also produce a lot more electricity in that hour.

How much gasoline does a generator use in a day?

A generator will typically use around 3.12 gallons to 10.56 gallons of gasoline in a day.

At least without considering the fact a generator will not always run continuously for a day.

In practice, you will use slightly less gasoline since your generator has to rest in between refuel sessions.

Gasoline generator fuel consumption chart

The chart below is a rough estimation of how much gasoline portable generators of different power levels use.

Generator Size
In Peak Watts
25% Load50% Load
2200 Peak Watts0.1 Gallons/Hr0.16 Gallons/Hr
2500 Peak Watts0.1 Gallons/Hr0.16 Gallons/Hr
3500 Peak Watts0.19 Gallons/Hr0.29 Gallons/Hr
4500 Peak Watts0.21 Gallons/Hr0.32 Gallons/Hr
7500 Peak Watts0.4 Gallons/Hr0.6 Gallons/Hr
10,000 Peak Watts0.47 Gallons/Hr0.71 Gallons/Hr
15,000 Peak Watts0.81 Gallons/Hr1.22 Gallons/Hr
Gasoline generator fuel consumption chart

How much propane does a generator use?

A portable dual fuel generator typically uses around 0.91 lbs to 2.22 lbs which is about 0.21 gallons to 0.51 gallons of propane an hour.

This means a portable propane generator uses around 21.84 lb to 53.28 lb of propane a day.

Whole house standby generators typically use around 1 to 2 gallons which is about 4.35 lb to 8.7 lb of propane an hour at 50% load.

A standby propane generator will use around 48 gallons to 192 gallons of propane in a day.

How much propane does a generator use per hour?

A portable generator typically uses around 0.91 lbs to 2.22 lbs which is about 0.21 gallons to 0.51 gallons of propane per hour.

Standby propane generators will use around 1 to 2 gallons which is about 4.35 lb to 8.7 lb of propane an hour.

The actual size of your propane generator will influence the actual fuel consumption a lot.

There are only so many watts you can get out of a gallon of propane.

How much propane does a generator use in a day?

A portable generator uses around 21.84 lb to 53.28 lb of propane in a day.

You do want to give your portable generator enough rest. Some models won’t be able to run continuously for 24 hours.

A standby generator uses around 104.4 lb to 208.8 lb of propane in a day.

These machines can typically run for 24 hours or more as long as you have enough fuel. However, they will still need some rest e

Propane generator fuel consumption chart

You can find how much propane generators of different power levels typically use in the fuel consumption chart below.

Generator Size
In Peak Watts
25% Load50% Load100% Load
2500 Peak Watts (Portable)0.18 Gallons/Hr0.28 Gallons/Hr
4500 Peak Watts (Portable)0.21 Gallons/Hr0.32 Gallons/Hr
7500 Peak Watts (Standby)0.87 Gallons/Hr1.42 Gallons/Hr
8500 Peak Watts (Standby)1 Gallon/Hr1.5 Gallons/Hr
9000 Peak Watts (Portable)0.55 Gallons/Hr0.83 Gallons/Hr
14,000 Peak Watts (Standby)1.6 Gallons/Hr2.6 Gallons/Hr
15,000 Peak Watts (Portable)0.77 Gallons/Hr1.15 Gallons/Hr
18,000 Peak Watts (Standby)1.7 Gallons/Hr3.02 Gallons/Hr
22,000 Peak Watts (Standby)2 Gallons/Hr3.6 Gallons/Hr
26,000 Peak Watts (Standby)2.06 Gallons/Hr3.63 Gallons/Hr
Propane generator fuel consumption chart

How much natural gas does a generator use?

An at-home standby natural gas generator uses around 100 ft³ to 200 ft³ of natural gas an hour.

In turn, a standby natural gas generator uses around 240 ft³ to 480 ft³ of natural gas per day.

How much natural gas does a generator use per hour?

An at-home standby natural gas generator uses around 100 ft³ to 200 ft³ of natural gas an hour.

What size your natural gas generator is, its brand, and its design will influence the actual natural gas fuel consumption a lot.

How much natural gas does a generator use in a day?

A standby natural gas generator uses around 240 ft³ to 480 ft³ of natural gas per day.

Since standby natural gas generators can typically run a long time, you can multiply the fuel consumption times 24 hours in a day.

At the same time, you do still need to know that your standby generator will need a break sooner or later.

Natural gas generator fuel consumption chart

This natural gas generator fuel consumption chart gives you an overview of how much fuel these types of generators use.

Generator Size
In Peak Watts
50% Load100% Load
8500 Peak Watts (Standby)97.5 ft³/Hr139.8 ft³/Hr
10,000 Peak Watts (Standby)101 ft³/Hr127 ft³/Hr
12,500 Peak Watts (Standby)122.2 ft³/Hr198.1 ft³/Hr
14,000 Peak Watts (Standby)116.5 ft³/Hr180.1 ft³/Hr
18,000 Peak Watts (Standby)169 ft³/Hr247 ft³/Hr
22,000 Peak Watts (Standby)185 ft³/Hr280 ft³/Hr
26,000 Peak Watts (Standby)188 ft³/Hr3.33 Gallons/Hr
Natural gas generator fuel consumption chart

How much diesel does a generator use?

According to Hardy Diesel, diesel generators that range from 8000 to 40000 peak watts of use around 0.39 gallons to 2.3 gallons of diesel an hour at 50% load.

Stronger diesel generators from 60,000 to 125,000 peak watts and more use around 2.9 to 5 gallons of diesel an hour at 50% load.

How much diesel does a generator use per hour?

A diesel generator with 10,000 peak watts uses around 0.53 gallons of fuel per hour at 50% load.

As you can expect, the actual size of your diesel generator will influence the fuel consumption a lot.

A generator with 75,000 peak watts will use around 3.4 gallons of diesel per hour at 50% load.

How much diesel does a generator use in a day?

Diesel generators that range from 8000 to 40000 peak watts of use around 9.36 gallons to 55.2 gallons of diesel in a day at 50% load.

Stronger diesel generators from 60,000 to 125,000 peak watts and more use around 69.6 to 120 gallons of diesel in a day at 50% load.

Diesel generator fuel consumption chart

You can find some of the main generator diesel consumption rates in the chart below according to the research of Hardy Diesel.

Generator Size
In Peak Watts
50% Load75% Load100% Load
8000 Peak Watts0.39 Gallons/hr0.54 Gallons/hr0.69 Gallons/hr
10,000 Peak Watts0.53 Gallons/hr0.65 Gallons/hr0.88 Gallons/hr
15,000 Peak Watts0.69 Gallons/hr0.94 Gallons/hr1.22 Gallons/hr
20,000 Peak Watts0.90 Gallons/hr1.30 Gallons/hr1.60 Gallons/hr
30,000 Peak Watts1.80 Gallons/hr2.40 Gallons/hr2.90 Gallons/hr
40,000 Peak Watts2.30 Gallons/hr3.20 Gallons/hr4.00 Gallons/hr
60,000 Peak Watts2.90 Gallons/hr3.80 Gallons/hr4.80 Gallons/hr
75,000 Peak Watts3.40 Gallons/hr4.60 Gallons/hr6.10 Gallons/hr
100,000 Peak Watts4.10 Gallons/hr5.80 Gallons/hr7.40 Gallons/hr
125,000 Peak Watts5.00 Gallons/hr7.10 Gallons/hr9.10 Gallons/hr
Diesel generator fuel consumption chart

FAQ

How much propane does a Generac generator use?

A 14kW Generac standby generator uses around 1.81 gallons of propane an hour at 50% load.

How much propane does a 20kW generator use per hour?

A 20kW standby generator uses around 2.39 gallons of propane an hour at 50% load.

How much propane does a 22kW generator use?

A 22kW standby generator uses around 2.53 gallons of propane an hour at 50% load.

How much gas does an RV generator use?

An average RV-friendly generators uses around 0.2 gallons of gasoline an hour.

How much natural gas does a Generac generator use?

An 18 kW Generac standby generator uses around 169ft³ an hour at 50% load.

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

Yes, a generator uses more gas with more, and specifically stronger, things plugged in.

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Author:

Mats is the founder and head editor of Generator Decision. With a combination of critical thinking, tireless research, and a healthy interest in electronics he helps people find the right generators and how to use these. At this point in the journey, Mats has done research on hundreds of portable generators.