re: What has the historic spread been for retail regular vs premium gasoline.

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I happened to see it was $1.20 difference at a station I was at this morning.

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I wonder if what you saw was actually a price difference between ethanol vs non-ethanol gas.

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So what happens if you put regular gas in a Huracan thats naturally aspirated?

How something turbocharged like a McLaren or Ferrari 488?

Obviously theres no reason to do that but I'm curious.

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These days, likely nothing because the ECU will detect any knock and detune the engine in various ways to eliminate the knock at a hit in performance, fuel economy, etc., It'll do everything it can to protect the engine, but if you're a big dummy and put 87 octane in your Hurrican and then start making hard passes down the dragstrip, well, your results may vary.

In older cars without ECUs that can detect knock and detune the engine, you run the risk of engine damage, though that usually takes using subpar octane for a pretty long time. However, in some extreme performance engines or under heavy driving conditions, engine damage can happen very quickly once the onset of knock occurs.

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gas stations lately. They are mostly run by Indians

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I doubt that, Pakistanis usually run gas stations while Indians run hotels

Was just talking about this yesterday when noticed my Costco was $.50 cent gap

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This was a Uptown place I usually avoid as I am a Costco regular. The place is usually about .40 a gallon or more higher than Costco on regular.

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You'll find that with a lot of big name stations like Shell, Texaco, Chevron, Mobil, etc.

And more so in neighborhoods where people are perceived to have more money.

Not $0.10, but rather 10% is historically close.

Member when diesel was 30-40 cents cheaper per gallon?

I member