Dollar for dollar, your vehicle will get almost the same distance on E85 and regular unleaded.
Meaning:
If you get 20 MPG on unleaded gasoline that you paid $2.00/gal. You will get 10 MPG on E85, but only pay $1.00.
All numbers are hypothetical.
These were my experiences with multiple vehicles I have rented over various times.
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I do the things that I must, and really regret, are unfortunately necessary.
RIP OBG