2014 Ford Focus SE (flex fuel) mpg is horrible?
So we got a flex fuel rental car and the first week we had the rental was great. We didn't have to fill up at all. After the first week i accidentally put regular gas (about half a tank) and the mpg was terrible, it barely lasted a day. The second time i filled up (to full) the tank was almost empty and i used E-85. It lasted about two days and i only got 23.3 miles. I'm still using the E-85 and getting about 23 mpg.
I don't know what the rental place put in the car, but how can i get my gas mileage back up to what is was during that first week. Should i try regular 87 gas again but use a full tank? Any suggestions?
A flex fuel engine takes time to adjust to changing fuel. Gasoline is known to contain more energy than ethanol.
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