I ended my E0 testing after two tanks. The MPG gain was near expected (in the 3% range). The financial/time cost (+$1 per gallon/3 hour round trip to fill up) did not justify continuing the test. I will revisit it at a later date.
E0 is fabulous for old lawn mowers, weed wackers, motorboats, and classic cars. But it offers no cost advantage for modern vehicles (that have been designed to run on E10).
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