What happens if you put 87 gas in a car that requires 91?

If you usually fill your tank up with 87-octane gasoline and you accidentally put in a higher octane blend (say, 91, 92, or 93), don’t worry. You’re actually filling your car or truck with a different blend of gas, which means it will burn differently in your engine.

What happens if you pump 87 instead of 91?

“Use premium unleaded gasoline with a posted octane rating of 91 or higher. If the octane rating is less than 91, you could damage the engine and may void your vehicle warranty. Some manufacturers recommend premium gas but say that regular or mid-grade gas can be used instead.

Can I run 87 octane on a 91 tune?

Exactly. You can run higher than you are tuned for, but you can’t run lower.

What happens if you put 87 octane fuel in a car?

In a high performance engine with higher compression, 87 octane will ignite itself from the heat of compression during the compression stroke. The computer will see that as a misfire and the incomplete combustion gases will flow down to the catalytic converter.

What is the best octane for gas?

The three tiers of gasoline (87, 89 and 93 octane) are all next to each other on the pump and it’s not hard to absentmindedly push the wrong button. Using a higher octane than necessary If you opt for a higher octane than your manual recommends—say, 89 instead of 87—your car will be perfectly fine, an article on AAMCO’s blog explains.

Does high octane fuel really increase gas mileage?

I’ve heard from some people that high octane fuel will increase gas mileage. Around here, we have the basic unleaded(87), mid-grade(89), and premium(93 or 91). I’ve been using the basic 87 unleaded forever because it was the cheapest. Also, in my car’s manual it recommend the lowest grade to use is 87(Grand Am 2004 V6)

What is the meaning of octane rating?

Octane rating is the measure of a fuel’s ability to resist “knocking” or “pinging” during combustion, caused by the air/fuel mixture detonating prematurely in the engine. In the U.S., unleaded gasoline typically has octane ratings of 87 (regular), 88–90 (midgrade), and 91–94 (premium). Gasoline with an octane rating of 85 is available in some