Redundant question. Again. Ethanol

Riverbed

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19680
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Had a boat with twin Volvo 5.7's, one year old, aluminum fuel tanks delivered at a distance of about 250 miles. First 125 miles was with MTBE fuel. Tanks almost drained then refueled with E10 fuel, 150-ish gallons plus 2 gallons of K100. Final 125 miles plus another 50 just banging around in 3-5 foot seas with a lot of chop produced no adverse effects - everything got shaken up and everything ran great. Now it's time to refuel with the locally available MTBE. Answers from local Volvo servicers range from, "Just use up as much of the E-10 as you can and fill it with the MTBE," to, "Just drain it as much as you can, throw in a bunch of additive to boost the octane and fill it." Any success stories, horror stories? What do y'all suggest? (Please don't suggest, "switching to sail.")
 
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