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I've read that diesel is in the 15-25 octane range. Low grade D2 has an higher octane number. So if you fill 15% with D2 that would be say 25 octane, and 85% Premium at 97 octane, you get a net blend a tad over 86 octane. I'd be willing to try 15% diesel in my Elantra next summer. Not on a regular basis, but just to see how it works out. You could even safely run higher blends provided you keep your foot off the pedal a bit.
Bio Diesel has a very high cetane number, that would make knock matters worse.
That's right Frank. That's why if I would try it I'd crank the WAI as high as I can and keep the revs low to give the diesel fuel as much chance as possible.
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