2011 Ford Crown Vic Police Interceptor tank #1

I picked up a 2011 Ford Crown Victoria Police Interceptor, which is a flex fuel vehicle.  I am going to keep track if its mileage on E85.  This is primarily a work vehicle and it gets driven to work on suburban roads and highway, about 50-50 mix.

Today it was at 105619 miles, the last fillup was at 105337.  I filled up with 18.423 gallons of E85 @ $1.759 / gallon.  That works out to 15.3 miles per gallon.

Premium was at $2.45 per gallon today, for a savings of $12.16 per tank.

At some point I will keep track of my mileage on regular unleaded to see how much of a mileage hit I take on E85.  It might be as high as 5 mpg, we will see.

tank #31

It's been awhile since I filled this vehicle up with E85.  The pumps at Meijer have been out of order, I've probably gone through 3 tanks of straight 87 octane gas.  No driveability issues whatsoever.

gallons e85: 4.002 @ $1.759 / gallon
gallons 87 octane gas: 8.749 @ $1.959 / gallon

ethanol % per tank: 28.49%
octane per tank: 91.232

savings per tank vs. premium @ $2.359 / gallon: $5.90

Notice that the differential between E85 and gas has come down to 20 cents from 30 cents per gallon.  I don't know if this reflects winter E85 vs. Summer E85 (more gasoline in the E85 in winter).