I have gotten around 35mpg as well. Usually heading south with a north wind and in traffic at 70mph average. 93/E30 mix. Maybe even slightly higher. So 'optimal' driving conditions.That's pretty absurd mpg for e30. I can only assume you were cruising down a straight road at 60mph, with fields of corn on either side, and some of corn vapors were going into your intake to give you that extra efficiency.
That being said it is highly temp dependent. If it is below 40F, mileage drops. Usually average 28-30mpg all around. 24-25mpg when rodding on it a bit.
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