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The Types Of Gas A Chevy Blazer Uses (All Generations)

On this blog, we carry out a lot of research and analysis on the specific questions you have, no matter how simple or technical they get. Today we are looking at Chevy Blazer – all of its generations, along with confusing names. We are mainly looking at the aspect of fuel requirement and everything related. Here’s a quick answer before we go into details.

Each generation has its engine options with different fuel requirements. In general, V8s (big block Chevys) require premium 93 octane gas while the small block Chevys require mid-grade. All the other engines are designed to run regular gasoline having a minimum octane rating of 87.

This was just the tip of the iceberg. We will detail how even the same model with different trim levels would require different types of octane-rated fuel. We will start with the first generation of Chevy Blazer that debuted in 1969, and then onwards, we will move to the latest model. 

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Also read: How Many Miles Can A Chevy Blazer Last? (Answered)

Fuel Requirements Based On Engine Type And Generation

Full-Size Chevy Blazer SUV First Generation 1969-1972

All six-cylinder engines use regular gas. V8s require premium gas with the exceptions; 327, 350, and 396 cubic inch variants.

EngineFuel Requirement
250 CID L22 Inline-6Regular 87 Octane (pump gas) or higher
292 CID L25 Inline-6Regular 87 Octane (pump gas) or higher
307 CID V8premium 93
LS9 350 CID V8premium 93

Full-Size Chevy Blazer SUV Second Generation 1973-1991

V8s require premium gas with the exceptions; 327, 350, and 396 cubic inch variants.

EngineFuel Requirement
250 Inline-6Regular 87 Octane (pump gas) or higher
292 CID Inline-6Regular 87 Octane (pump gas) or higher
V8 with four different options; viz, 305 CID, 307 CID, 350 CID, 400 CIDMid-Grade 91 required premium 93 preferred
6.2L Detroit Diesel LH6 V8 premium 93

Full-Size Chevy Blazer SUV Third Generation 1992-1994

EngineFuel Requirement
5.7L 350 CID V8 LO5Mid-Grade 91 required premium 93 preferred
6.5L Detroit Diesel Turbocharged V8premium 93

Full-Size Chevy Blazer SUV Fourth Generation 1995-1999

Blazer was coming up with two different sizes, so the bigger version was named Tahoe, and the smaller mid-size Blazer was the Blazer to make matters easy. And up to this day, the full-size SUV segment of Chevrolet is ruled by the flagship Tahoe. The mid-size Blazer will see another confusing change in the coming years to give you a glimpse into the later section of this article.

EngineFuel Requirement
5.7L LO5 small block V8Mid-Grade 91 required premium 93 preferred
6.5L Detroit Diesel Turbocharged V8premium 93


These engines are made for performance. It’s best to use premium fuel. If you can’t find premium, then you can use mid-grade, only for the time being.

Mid-size Chevy Blazer SUV First Generation 1983-1994

Now coming to midsize Blazer, also known as the S10 Blazer, to keep you confused – the first generation debuted in 1982 with the S-10 platform to be sold in 1983. This segment was introduced to compete with the competitors who were selling these compact SUVs like hotcakes.

With 4.3L (code W) engine, use 91 or higher unleaded gasoline. For all the remaining engine options, only use 87 or higher.  When you are towing or have a high payload requirement, it is preferred to have high octane gasoline instead of the usual 87. High octane gasoline will give you better performance. For lighter loads, you can use mid-grade fuel.

EngineFuel Requirement
1.9L (1983-1985)Regular 87 Octane (pump gas) or higher
2.0L OHV inline-4 (1983-1985)Regular 87 Octane (pump gas) or higher
2.8L V6Regular 87 Octane (pump gas) or higher
Fuel-injected 2.5L (Iron Duke) 1985-1989Regular 87 Octane (pump gas) or higher
4.3L V6Mid-Grade 91 or higher octane rated gasoline
2.8L V6 (1989-1990)Regular 87 Octane (pump gas) or higher

Mid-size Chevy Blazer SUV Second Generation 1995-2005

It is recommended to use 87 or higher octane-rated fuel. In situations where you are towing a lot of weight, you should use premium, and in case the weight isn’t that much, you can use mid-grade instead. 

EngineFuel Requirement
Vortec 4300 V6Regular 87 Octane (pump gas) or higher

It depends on the situation, whether you have a heavier load or a lighter load. Ethanol up to 10% would be okay to use.

Mid-size Chevy Blazer SUV Third Generation 2002-2009

Alongside the second generation, the third generation was also being sold.  After this generation, the name Blazer went dormant. The platform was renamed Traverse after this generation. The third-generation Blazers were now called the Chevrolet TrailBlazer.

EngineFuel Requirement
4.2L inline-6 DOHC Vortech 4200Regular 87 Octane (pump gas) or higher
5.3L V8Mid-Grade 91 or higher octane rated gasoline
6.0L V8Premium Gas 93 Octane
LS2 C6 Corvette engine (SS model)Premium Gas 93 Octane

These were the Blazer’s high-end models that were fitted with big engines. The compact design having big engines is the recipe for performance. These engines will require high-quality fuels. It’s better to use mid-grade regularly with the mixing of premium once in a while to keep things clean.

Mid-size Crossover Chevy Blazer SUV 2019-Present

EngineFuel Requirement
2.5L Inline-4 Ecotec LCVRegular 87 Octane (pump gas)
3.6L V6 LGXRegular 87 Octane (pump gas)
2.0L turbocharged inline-4 LSYRegular 87 Octane (pump gas)

What Types Of Gasoline Can And Can’t Be Used?

Chevys Recommendation

The company itself recommends the TOP TIER Detergent Gasoline to keep your engine cleaner and help reduce carbon deposits. Chevy also recommends using gasoline that has a minimum octane rating of 87. It advises against using gasoline that has an octane number of less than 87. Some engines require mid-grade gasoline and others require premium.

We have gone through all of them in detail.

Reformulated Gasoline

It’s one of the newer types of gasoline available in the market, specifically designed to have fewer carbon emissions compared to conventional gasoline. Although it’s not on the list of recommended fuels, you can, however, use RFG — it’s safe and wouldn’t cause damage to the engine.

This fuel is handy in areas that have strict emission requirements. However, people in regions with extreme pollution should have reformulated gasoline regardless – as it would help the environment by exposing it to fewer emissions, less smog, and most importantly, we get a better Air Quality Index.

Even though Chevys Owners Manual hasn’t specified whether or not you can use this type of fuel, you can have reformulated gas in your tank. On top of all the other measures, if you are worried about the emissions test, go for the RFG.

Gasoline/Oxygenated Blends Or E-85

Blazer is not flex-fuel-appropriate. It would be best if you did not put anything with more than 15% ethanol, and E85 has 85% ethanol, which the manufacturer does not recommend. It’s advised against using the E85. This fuel is also known as Flex-fuel, and you are not allowed to put this fuel in your Chevy Blazer. If you do so, you will be damaging your engine components.

Flex-fuel contains 85% ethanol. Although it runs pretty clean in the engine, it has corrosive nature. Normal vehicles are not designed for flex-fuel. They are wonderful at running on regular gasoline. To know if a particular vehicle can run on E85, you can take a look at the gas cap. Or you can take a look at the gauge cluster. Sometimes it’s mentioned on the fuel gauge.

Gasoline With Added Materials

Chevy recommends the TOP TIER detergent gasoline additive, which will keep your internals clean and prevent carbon deposits. And it advised against using octane boosters additives. Octane boosters and other additives have methanol, ferrocene, aniline, and methylal, which damage the fuel lines.

These substances corrode the metal and even damage the rubber components, and these are the kind of damages that will not be covered in the warranty. If TOP TIER detergent gasoline is not available in your region, you can put ACDelco Fuel System Treatment Plus-Gasoline instead.

Gasoline With MMT

MMT stands for Methylcyclopentadienyl manganese tricarbonyl, which can severely damage your emission system as well as your spark plugs. It is advised against using these additives. Any damage caused by these additives will not be covered in the warranty.

Biodiesel

The Ultra-Low Sulphur Diesel (ULSD) is very stable. For everyday driving where diesel might be sitting in the gas tank for about 4-6 weeks, it is advised to use not more than 5% by volume B5. Biodiesel, on the other hand, is not. However, if the fuel does not remain in the tank for more than four weeks, and you filling with fresh diesel, you may use biodiesel more than 5% by volume – up to 20%.

To keep the internals clean, Chevy recommends using TOP TIER Diesel Fuel to keep the carbon debris level as low as possible. You can find it here  www.toptiergas.com. If you cant find this in your country, you can use ACDelco Diesel Fuel Conditioner instead. These additives enhance the diesel performance by making it more stable.

What If I Hear A Knocking Noise From The Engine After Refilling

A very little knocking is not uncommon. Most of the engines will have a slight knocking sound which isn’t a big deal. But, if you hear a loud knocking noise sometime after refueling with 87 octane, you would have to put in high octane-rated gasoline. After running your engine for a while, if you still hear loud knocking, then your engine needs service.

Also read: The Oil Type, Weight, And Capacity Of A Chevy Blazer

Does the Chevy Blazer Have Good Gas Mileage?

Full-Size Chevy Blazer SUV First Generation 1969-1972

EngineCity MPGHighway MPG
250 CID L22 Inline-61517
292 CID L25 Inline-61413
307 CID V81113
LS9 350 CID V81014

Full-Size Chevy Blazer SUV Second Generation 1973-1991

EngineCity MPGHighway MPG
250 Inline-61517
292 CID Inline-61516
V8 with four different options; viz, 305 CID, 307 CID, 350 CID, 400 CID9-1113-15
6.2L Detroit Diesel LH6 V8 1416

Full-Size Chevy Blazer SUV Third Generation 1992-1994

EngineCity MPGHighway MPG
5.7L 350 CID V81115
6.5L Detroit Diesel Turbocharged V889

Full-Size Chevy Blazer SUV Fourth Generation 1995-1999

EngineCity MPGHighway MPG
5.7L small-block V81216
6.5L Detroit Diesel Turbocharged V889

Mid-size Chevy Blazer SUV First Generation 1983-1994

EngineCity MPGHighway MPG
1.9L (1983-1985)2328
2.0L OHV inline-4 (1983-1985)2225
2.8L V6 (1989-1990)1819
Fuel-injected 2.5L inline-4 (Iron Duke) 1985-19892125
4.3L V61618

Mid-size Chevy Blazer SUV Second Generation 1995-2005

EngineCity MPGHighway MPG
Vortec 4300 V61113

Mid-size Chevy (Trail) Blazer SUV Third Generation 2002-2009

EngineCity MPGHighway MPG
4.2L inline-6 DOHC Vortech 42001619
5.3L V81517
6.0L V81315
LS2 C6 Corvette engine (SS model)1416

Mid-size Crossover Chevy Blazer SUV 2019-Present

EngineCity MPGHighway MPG
2.5L Inline-4 Ecotec LCV2529
3.6L V6 LGX2227
2.0L turbocharged inline-4 LSY2427

What’s The Gas Tank Size Of A Chevy Blazer?

Full Size SUV

GenerationTank Size
First Generation 1969-1972Standard – 25 gallons
Station Wagon – 22-gallons
Second Generation 1973-1991 Standard – Gas – 25 gallons
Standard – Diesel – 27 gallons
NK7 Option – Gas – 31 gallons
NK7 Option – Diesel – 32 gallons
NE2 Option – Gas – 40 gallons
NE2 Option – Diesel – 41 gallons
Third Generation 1992-1994  20 gallons
Fourth Generation 1995-19992 door models – 20 gallons
4 door models – 19 gallons

Mid-Size SUV

GenerationTank Size
First Generation 1983-199420 gallons
Second Generation 1995-200520 gallons
Third Generation 2002-200918.7 gallons
Fourth Generation 2019-PresentFront Wheel Drive – 19.4 gallons
All Wheel Drive – 21.7 gallons

How Much Does It Cost To Fill Up A Chevy Blazer

The most expensive place to fill up your tank is California, and the cheapest ones are Mississippi and Texas. In California, the price of a gallon of regular gasoline is $4.388, and the total cost to fill an empty 20-gallon tank is $87.76, while the same amount of gas will cost you $56.32 in Mississippi or Texas.

The prices vary according to your location and your vehicle’s trim level. So whichever state you are in, the cost to fill up a Chevy Blazer is somewhere between $55-$90. The prices also vary when you add the mid-grade or premium instead.

Sources