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The problem with data collected over years is the variable of changes to the car, wear and tear, brakes dragging, changes in tires, driving style, commute etc...
A better collection of data would be to 3 tanks E10 and then 3 tanks E0 and repeat. That would help cancel out all other variables. My years of data with my wifes 02 FFV suburban showed a 18% drop in mileage from E10 to E85, mostly her driving. Her Impala shows the same 18-20% loss. I've never run enough E0 in either to see a difference.
E0 nets higher MPG with my Cobalt and higher cost per mile.
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