# How to Make Premix Fuel [Premix Ratio Charts]

You can create premix fuel by mixing 2-stroke oil with gasoline in the appropriate proportions. The required gas-oil mix ratio is described in the manual of each machine, but the majority of 2-stroke engines require 1:40 or 1:50 mixtures. These ratios mean you have to add 1 part 2-stroke oil to 40 or 50 gallons of gas.

But if you don’t feel like calculating and would rather just get the values from a chart, you’ve come to the right place.

We at PowerSportsGuide have compiled the most common conversion numbers into some fuel mixture charts!

Contents

## What is a Premix Fuel?

As the name suggests, premix fuel (a.k.a. pre-mixed fuel, or just premix) is a mixture of gasoline and a small amount of 2-stroke oil. Premix fuel is commonly used for fueling 2-stroke internal combustion engines. The main idea behind mixing oil into gasoline is to ensure lubrication for these power sources.

These simpler engines are usually nestled in machines like leaf blowers, chainsaws, and grass trimmers. Surprisingly, certain vehicles like dirt bikes, ATVs, and vintage jet skis still run on premix.

You can get premix fuel in two ways; making your own fuel by mixing oil and regular gas in a can, or purchasing pre-mixed fuel. The latter is typically much less affordable and not always available with the required mixing ratio.

Because of this, it’s always good to know how to make premix fuel by yourself.

Without further ado, let’s see how can you do this!

## What is the Ratio for 2-Stroke Fuel Mix?

If you want to make premix fuel, you have to figure out the required mix ratio as the first step.

Generally speaking, the most common fuel mix ratios for 2-stroke engines are 1:40 and 1:50, but certain engines require 1:30 – 1:20. If you need a 1:40 mixture, this means that you have to mix one part oil into 40 parts gas.

Note that the required mix ratio varies from one machine to the next, so there’s no “universal” ratio that exists and works with every engine.

The required fuel-oil ratio is always described in the machine’s owner’s manual, but it is also often displayed on a decal on the machine.

Best practice is to read and follow the manufacturer’s recommendation to ensure the best lubrication.

### How do You Calculate the Fuel Mixture Ratios?

Since the quantity of 2-stroke oils is typically expressed in ounces on the bottle, it makes sense to calculate the amount of the required oil in this unit. Since one gallon is equal to 128 ounces, you have to divide 128 by the exact ratio to get the required oil per gallon of gas in ounces.

Are you confused?

Let’s see some examples!

How do you calculate a 75 to 1 ratio?

For a 75:1 mixture, you have to mix 1 gallon of 2-stroke oil into 75 gallons of gas, or 1.71 ounces of oil into one gallon of gas. (Calculation: 128/75 = 1.71)

How do you calculate a 50 to 1 ratio?

For a 50:1 mixture, you have to mix 1 gallon of 2-stroke oil into 50 gallons of gas, or 2.6 ounces of oil into one gallon of gas. (Calculation: 128/50 = 2.6)

How do you calculate a 40 to 1 ratio?

For a 40:1 mixture, you have to mix 1 gallon of 2-stroke oil into 40 gallons of gas, or 3.2 ounces of oil into one gallon of gas. (Calculation: 128/40 = 3.2)

How do you calculate a 32 to 1 ratio?

For a 32:1 mixture, you have to mix 1 gallon of 2-stroke oil into 32 gallons of gas, or 4 ounces of oil into one gallon of gas. (Calculation: 128/32 = 4)

How do you calculate a 25 to 1 ratio?

For a 25:1 mixture, you have to mix 1 gallon of 2-stroke oil into 25 gallons of gas, or 5.12 ounces of oil into one gallon of gas. (Calculation: 128/25 = 5.12)

How do you calculate a 20 to 1 ratio?

For a 20:1 mixture, you have to mix 1 gallon of 2-stroke oil into 20 gallons of gas, or 6.4 ounces of oil into one gallon of gas. (Calculation: 128/20 = 6.4)

### Premix Fuel Ratio Chart

For your convenience, we’ve calculated the required oil per gallon figures for the most common premix ratios into one chart:

## Fuel Premix Charts

### 100 to 1 Fuel Mix Chart

These charts are only for informational purposes!

## How do You Create Premix Fuel?

You can create premix fuel yourself by following these simple steps:

1. Read your machine’s owner’s manual to get the required mix ratio.
2. Figure out how much fuel you need.
3. Calculate the required amount of 2-stroke oil.
4. Get the right-size fuel can pour the half the gas into it.
5. Pour the oil into the gas.
6. Shake the can thoroughly.
7. Fill the other half of the fuel into the can – make sure that you fill the right amount of fuel into the can to reach the required mixture ratio.
8. Give the can a few more shakes

Here are some tips to avoid the most common mistakes that are often made when creating premix:

• As the name suggests, premix fuel has to be mixed before you pour the fuel into the tank. Never mix the fuel inside the fuel tank!
• Don’t pour the oil into a full can of gas, since a full fuel can can’t be shaken properly.
• Never use gas with an ethanol content of more than 10%.
• Label the can containing the mixture to prevent accidentally using it in other machines.
• Don’t let the mixture sit too long, as it may start to separate or gum up.

## Takeaways – FAQs About Fuel Mixtures

As a takeaway, we’ve answered the most common questions on the topic!

What is the correct 2-stroke mixture?

Contrary to popular belief, the “best 2-stroke mix ratio” that works for each 2-stroke engine doesn’t exist. The required mix ratio is always clearly stated in the manual of each vehicle or piece of power equipment.

What is the difference between the 1:40 and 1:50 fuel mix?

The difference between 1:40 and 1:50 mixture ratios is the amount of oil required to make the mixture. 1:40 fuel mix requires 1 part oil and 40 parts gas, while 1:50 fuel mix requires 1 part oil and 50 parts gas.

What are the most common ratios to mix fuel with 2-stroke oil?

The most common 2-stroke oil ratios are 1:40 and 1:50, but mixtures can go from as lean as 1:100 to as rich as 1:20.

What is a 20 to 1 mix ratio?

20 to 1 or 1:20 mix ratio means you have to mix 1 part oil into 20 parts gas. For example, you need 1 gallon of oil for 20 gallons of gas or 6.4 ounces of oil for 1 gallon of gas.

What is a 25 to 1 mix ratio?

25 to 1 or 1:25 mix ratio means you have to mix 1 part oil into 25 parts gas. For example, you need 1 gallon of oil to 25 gallons of gas or 5.12 ounces of oil to 1 gallon of gas.

What is a 32 to 1 mix ratio?

32 to 1 or 1:32 mix ratio means you have to mix 1 part oil into 32 parts gas. For example, you need 1 gallon of oil to 32 gallons of gas or 4 ounces of oil to 1 gallon of gas.

What is a 40 to 1 mix ratio?

40 to 1 or 1:40 mix ratio means you have to mix 1 part oil into 40 parts gas. For example, you need 1 gallon of oil to 40 gallons of gas or 3.2 ounces of oil to 1 gallon of gas.

What is a 50 to 1 mixture?

50 to 1 or 1:50 mix ratio means you have to mix 1 part oil into 50 parts gas. For example, you need 1 gallon of oil for 50 gallons of gas or 2.6 ounces of oil for 1 gallon of gas.

What is a 60 1 fuel mixture?

60 to 1 or 1:60 mix ratio means you have to mix 1 part oil into 60 parts gas. For example, you need 1 gallon of oil for 60 gallons of gas or 2.13 ounces of oil for 1 gallon of gas.

What is a 75 to 1 fuel mixture?

75 to 1 or 1:75 mix ratio means you have to mix 1 part oil into 75 parts gas. For example, you need 1 gallon of oil for 75 gallons of gas or 1.71 ounces of oil for 1 gallon of gas.

What is a 100 to 1 fuel mixture?

100 to 1 or 1:100 mix ratio means you have to mix 1 part oil into 100 parts gas. For example, you need 1 gallon of oil for 100 gallons of gas or 1.28 ounces of oil for 1 gallon of gas.

What is a richer mixture 1:50 or 1:40?

1:40 fuel mixture is richer than 1:50 since to create a 1:40 mixture you have to add 3.2 ounces of oil to one gallon of gas, but for a 1:50 mixture, you need only 2.6 ounces.

Disclaimer: This article is just for informational purposes! Always refer to your machine/vehicle’s manual for the correct mix ratio. Gallon measurements in this article are described in US gallons.

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