Quote:
Originally Posted by Jiggles
Actually a lot of stations have 91 that is no ethanol and 87 that is 10%. If you look at the pump it will tell you.
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Not necessarily, California does not require the ethanol content to be disclosed. For the most part, it's a good idea to do your own research into what has ethanol and what doesn't.
Quote:
Originally Posted by n4mwd
Its not the same as a diesel. A diesel doesn't even have a fuel charge when it compresses so there can never be compressive pre-detonation in a diesel. Diesel fuel does burn significantly slower than gasoline so if it had an octane rating, it would be way higher than 87.
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That's not really correct, because you are confusing the slow burning with the "slow to burn".
Diesel may burn more slowly, but that's not what octane is. Octane is the resistance to starting burning under compression. Since, as you say, it compresses and then injects the fuel, it can have a very low octane and function just fine. In fact, the searches I have done say that if it did have an octane rating, it would indeed be very low.
That being said, diesel runs under extreme pressures, and a higher octane diesel would probably work just fine.