High gas prices: Can you mix premium and regular gas to save on fuel costs? (2024)

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LOS ANGELES - With the average U.S. price for gasoline skyrocketing across the nation, many drivers, whose cars require premium gas, might be wondering if they can skimp out on the quality of fuel in order to save money at the pump.

Here’s what you need to know.

Can I put unleaded gas in my car if the label says it requires premium?

According to Fuel Express, if your vehicle manufacturer "recommends" premium gasoline then you can put in regular without losing sleep at night. However, some vehicles "require" premium gasoline.

If you put regular gas in those cars you may be looking at a serious service bill down the line.

"In most cases, the vehicle will run fine, but you may experience less power and a decrease in gas mileage. In more serious cases, you may hear engine knocking or valve chatter because the fuel isn’t burning right. These things could damage your engine and you should take it to your mechanic," explains Capitol Toyota, a California Toyota dealer on its website.

What is the actual difference between fuel types?

You might have noticed the giant yellow signs on each fuel nozzle that have a specific number. Those numbers represent octane levels in the fuel. The octane level is a measure of how heat resistant a particular fuel is in order to prevent what’s commonly known among mechanics as "knocking."

High gas prices: Can you mix premium and regular gas to save on fuel costs? (1)

A gasoline pump sits in a holder at an Exxon gas station in Washington, DC, on March 13, 2022.

You’ll know your motor is knocking when you hear a knocking noise which is a mixture of air-fuel in the engine's cylinders detonating prematurely.

"If your car has a performance-tuned engine rated for high-octane fuels, you could experience engine knock if you put in fuel with too low of an octane rating. High octane fuels burn more uniformly and resist knock," Capitol Toyota explains.

You can find out what octane level your car requires by referring to the vehicle’s owner's manual.

What if I dilute premium gas with unleaded gas to save money?

According to The Drive, a motorist publication, your car will "survive," if you mix regular and premium.

"That said, if your vehicle requires premium fuel, it’s a good idea to top it off with the good stuff as soon as you’re able," the website said. "If you’re really worried about the engine developing a knock, you can add just enough regular fuel to get you to the next station, but be sure you have enough fuel to reach the destination."

The price at the pump is $1.54 higher than it was a year ago.

The average U.S. price of regular-grade gasoline shot up a whopping 79 cents over the past two weeks to a record-setting $4.43 per gallon (3.8 liters) as Russia’s invasion of Ukraine is contributing to already-high prices at the pump.

Industry analyst Trilby Lundberg of the Lundberg Survey said Sunday the new price exceeds by 32 cents the prior all-time high of $4.11 set in July 2008.

In today’s dollars, the previous record would be equal to $5.30 a gallon, according to the U.S. Bureau of Labor Statistics’ inflation calculator.

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Lundberg said gas prices are likely to remain high in the short term as crude oil costs soar amid global supply concerns following Russia’s invasion of Ukraine.

Prices at the pump were rising long before Russia invaded Ukraine as post-lockdown demand has pushed prices higher. Crude prices plummeted in early 2020 as economies around the world shut down because of COVID-19 — the price of futures even turned negative, meaning some sellers were paying buyers to take oil. Prices rebounded, however, as demand recovered faster than producers pulled oil out of the ground and inventories dried up.

Then, the price increase accelerated after the war began.

Energy prices are also contributing to the worst inflation that Americans have seen in 40 years, far outpacing higher wages.

Nationwide, the highest average price for regular-grade gas is in the San Francisco Bay Area, at $5.79 per gallon. The lowest average is in Tulsa, Oklahoma, at $3.80 per gallon.

According to the survey, the average price of diesel also spiked to $1.18 over two weeks, to $5.20 a gallon. Diesel costs $2.11 more than it did one year ago.

The Associated Press contributed to this story.

High gas prices: Can you mix premium and regular gas to save on fuel costs? (2024)

FAQs

High gas prices: Can you mix premium and regular gas to save on fuel costs? ›

What if I dilute premium gas with unleaded gas to save money? According to The Drive, a motorist publication, your car will "survive," if you mix regular and premium. "That said, if your vehicle requires premium fuel, it's a good idea to top it off with the good stuff as soon as you're able," the website said.

Is it good to mix premium gas with regular gas? ›

There's nothing wrong with mixing premium and regular gas in the same tank. In fact, this is how midgrade gas is formulated at the station. Rather than drawing from a separate storage tank for each octane rating, gas pumps actively mix high-octane fuel with lower-octane fuel to create midgrade gas.

Can you mix cheap and expensive gas? ›

Is it bad to mix premium and regular gas? Well, not necessarily. If your car requires premium to run smoothly, but you aren't able to find a station with premium gasoline, it won't hurt to top off with regular gasoline. You do want to avoid running on regular gasoline for extended periods of time.

Is it okay to mix 87 and 93 gas? ›

Mixing 93 and 87 gas doesn't have any ill effects. It simply creates a new formula referred to as “midgrade” that's often available in gas stations. Additionally, the difference between premium and regular gas is that the premium ones are of higher quality.

Can you mix high and low octane gas? ›

Can I mix premium and unleaded gas? Yes, drivers can mix the two types of fuel. The combined gas types will result in an octane level somewhere in the middle — something the vehicle “will survive,” according to The Drive.

Is it bad to mix 87 and 91 gas? ›

You can absolutely mix octanes, and they mix linearly.

What happens if you mix 87 and premium gas? ›

What happens if you mix 87 and 91 gas? If you mix equal quantities, you would get 89 octane. That's actually how gas stations get their mid grade ( 89 octane fuel ). They only have 2 tanks - one with 87 and the other with 91.

Does premium gas clean your engine? ›

No matter what you've heard, premium-grade gasoline won't do more to clean deposits from your fuel injectors or other parts of the fuel system because today's regular gas contains the same detergent additives. The main difference with premium is its octane rating — 91 or higher compared with 87 for regular octane.

Does 93 gas last longer? ›

93 octane fuels are more refined and contain more stable hydrocarbons. These stable hydrocarbons can last 2-3 times longer than 87 octane fuel.

What happens if you mix two different gasoline? ›

So, can you mix 87 and 89 gas? You can mix 87 and 89 gas. However, it's a bad idea because the two fuels have different octane ratings. When you put them together in your car's tank, the engine will try to adjust to the lower octane rating of 87 and could potentially cause damage.

Does higher octane gas give better mileage? ›

Octane ratings alone do not equal better gas mileage. However, if your engine is knocking, it is not getting the designed mileage. In addition, some premium fuels are formulated with more detergents to help keep your fuel system clean, which also helps maintain the engine's designed mileage.

Is it bad to mix 91 and 93 gas? ›

If you mix half a tank of 93 octane with half a tank of 91 octane, it will give you 92 octane, more or less. It's fine mixing them, and this is essentially the reason that you can put a full tank of 87 in and an octane booster will—when mixed throughly—be 91 or above if you put the right amount in.

Is it bad to mix gas from different stations? ›

You get gasoline with the combined octane. If you mix a half tank of 91 octane and a half tank of 89 octane, you end up with a full tank of 90 octane. Unless you are driving a car that requires 93 octane, you won't damage a thing.

What happens if you don't put premium gas in a premium car? ›

Filling your premium only vehicle with regular gas can actually trigger engine knocking so significant that parts of your engine could suffer damage. In many cases, such damage is often not even covered by manufacturer warranties.

What happens if you mix 89 and 93 gas? ›

It's Just Math

It really is this simple: Equal amounts of 89- and 93-octane gas gives you a tankful of 91 octane. There's a misconception that the highest-octane choice, typically called premium, is somehow fundamentally different from the lower grades.

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