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It's a bit tough to get accurate test data with so many uncontrolled variables in actual driving conditions. 50% was definitely too much as indicated by poor cold temperature starting and idle as well as slight misfire under load. There were small incremental increases in mileage in the 10-30% range. My metering is not perfect, but I use the scan guage to judge consumption, then first add 1/3 diesel, move to the regular pump and complete the fill-up. Close enough to 30% for my purposes. Whether it is actually ideal..... can't say with certainty, but close enough for practical purposes.
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