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TOPIC: Just_Wondering
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I once owned a '69 VW bug. There was a factory sticker on the inside of the gas cap door that said "Minimum 91 octane". Yeah right.

Wenatchee WA
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My Land Rover 93 and it sucks on gas Low 20s on the open road .Wasn't my idea to lease it ,

Ronkonkoma NY
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I have a C230 supercharged 4. Premium Required.

I once owned a turbocharged 3 cylinder Sprint. Regular gas was just fine.

That Sprint was a fun car to drive, but a little scary at high speed. Get above about 90 or so (the speedo only went up to 80, so it's a guess), and the handling would get pretty squirrely...

Fullerton CA
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According to a table on Edmunds, they break down cars into "Premium Recommended" and "Premium Required". My X3 is on the "Premium Required".

"If your vehicle is on the "premium recommended" list, you're OK to try switching to regular unleaded gasoline. If, on the other hand, your car is on the "premium required" list, then you have to run premium fuel."

I'm still suspicious that this is just playing it safe, and unless you drive your car hard (conditions likely to induce knock) it will make very little difference.

Windermere FL
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If it's turbo charged don't chance it!

Rutherford NJ
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"Some cars require it like turbo charged engines."

Well, mine is a turbo v6. I don't know if it's a sham or what. Turbocharged engines run at higher compressions and at least in principle, this makes them more prone to engine knock and the higher octane thwarts this. Some engines are tuned to run on 87, but some are not.

So I dunno if my 89 minimum is just playing it safe, or if my engine is tuned to require it.

Windermere FL
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A lot of European cars that specify what would be mid grade are done so using an octane testing spec that is different from the US market. So for the most part in a lot of those....standard grade is fine....just usually stay with "Tier 1" gas.

Dalton GA
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Some cars require it like turbo charged engines. If your vehicle recommends premium you might be able to get away with a lower grade and lose just a little performance. If you try a lower grade and your engine pings it will hurt your engine. Some cars actually get higher gas mileage with higher octane. Best answer is to just give it a try and see what you get.

Rutherford NJ
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My 2013 BMW X3 says it requires 89 or higher.

So, at least as specified, yes.

Windermere FL
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On a related note to the original post...

Does any car actually require mid-grade gas? Or is it just a scam to get you to pay more?

Fullerton CA
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TOPIC: Just Wondering
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