Unleaded 88 can be confusing because the name sounds like it differs from regular 87 gas by only one number. The octane rating is one difference, but Unleaded 88 is also an ethanol blend called E15. Whether you can use it depends on your vehicle, so check the fuel label in your owner’s manual or on the fuel door before filling up.
What is Unleaded 88?
Unleaded 88 is a gasoline blend commonly sold as E15. It contains up to 15% ethanol and at least 85% gasoline. The “88” refers to its octane rating, not the amount of ethanol or a percentage of octane.
Octane measures a fuel’s resistance to engine knock. A higher number does not automatically mean more power or better fuel economy. Use the octane rating and ethanol blend your vehicle manufacturer specifies.
Regular 87 gas is commonly E10, which contains up to 10% ethanol, but the blend can vary. Check the pump label if you need to know exactly what is going into the tank.
Can my car use Unleaded 88?
The EPA approves E15 for model year 2001 and newer cars, light-duty trucks, and passenger SUVs, as well as flex-fuel vehicles. That is a useful starting point, but check your owner’s manual or fuel door for the recommendation for your exact vehicle. If it says not to use E15 or limits ethanol to 10%, follow that instruction.
| Fuel | Ethanol content | General guidance |
|---|---|---|
| E10 | Up to 10% | Approved for gasoline vehicles |
| E15, often sold as Unleaded 88 | Up to 15% | EPA-approved for many model year 2001 and newer light-duty vehicles. Check your manual. |
| E85 | Usually 51% to 83% | For flex-fuel vehicles only |
Do not use E15 in model year 2000 or older vehicles, motorcycles, boats, lawn mowers, or other small gasoline-powered equipment. Those are not included in the EPA’s E15 approval.
A vehicle that requires premium fuel may still have an ethanol restriction. Octane and ethanol content are separate requirements, so an 88 rating alone does not tell you whether the fuel is suitable. Check both the recommended octane and the maximum ethanol blend.
Unleaded 87 vs. Unleaded 88
The main difference is that Unleaded 88 is E15, while regular 87 is commonly sold as E10. Unleaded 88 also has a slightly higher octane rating. The extra octane is useful only if the engine can take advantage of it or requires it. It does not guarantee a noticeable performance increase in a vehicle designed for regular 87.
Ethanol contains less energy per gallon than gasoline, so fuel economy can be slightly lower with a higher ethanol blend. The difference between E10 and E15 may be small in normal driving, but a lower price at the pump does not automatically mean you will spend less per mile. Compare the price difference with your actual fuel economy.
Will Unleaded 88 damage my car?
If your vehicle is approved for E15 and the owner’s manual allows it, Unleaded 88 should not damage the car when used as directed. If your vehicle is older than model year 2001, or the manual says not to use E15, choose a fuel that meets the manufacturer’s recommendation.
Using the wrong ethanol blend repeatedly can create fuel-system or drivability problems in a vehicle that is not designed for it. Do not assume that every newer vehicle can use E15 just because it meets the model-year guideline. The owner’s manual and fuel-door label are the best checks for your specific car.
What if I accidentally put Unleaded 88 in my car?
First, check whether the vehicle is approved for E15. If it is, you can continue driving normally. If it is not approved, or you cannot confirm the recommendation, do not keep using E15. Contact a dealer or mechanic and tell them the vehicle’s year, make, and model, how much fuel you added, and how much was already in the tank.
If the engine starts running poorly or the check engine light comes on, pull over when it is safe and have the vehicle checked. One mistaken fill-up does not automatically mean the engine is damaged, but the right next step depends on the vehicle and how much E15 went into the tank.
Frequently asked questions
Is Unleaded 88 the same as E85?
No. Unleaded 88 is E15, with up to 15% ethanol. E85 contains a much higher ethanol blend and is for flex-fuel vehicles.
Does Unleaded 88 give a car more power?
Not automatically. The 88 octane rating does not make every engine produce more power. Use the fuel grade recommended by the manufacturer.
Can I use Unleaded 88 in a flex-fuel vehicle?
Flex-fuel vehicles can use E15. Check the owner’s manual for the full range of approved fuels. For more information, see our guide to using regular gas in a flex-fuel vehicle.
Is Unleaded 88 better than regular 87?
Neither is automatically better for every car. If your vehicle allows E15, compare the pump price with your real-world fuel economy. If the manual specifies a different fuel, follow that recommendation.
Bottom line
Unleaded 88 is E15, a gasoline blend with up to 15% ethanol and an 88 octane rating. It is approved for many model year 2001 and newer light-duty vehicles, but check your owner’s manual or fuel-door label before using it. Do not use it in older vehicles, motorcycles, boats, or lawn equipment. If you accidentally filled up with E15 in a vehicle that is not approved for it, contact a mechanic for advice before continuing to use the fuel.
