With many older vehicles, E85 is not recommended. In 2006 when I bought my truck, there was a "flex engine" option that allowed E85, but mine was the standard 5.4L that allows up to 10% ethanol. A new EPA mandate trying to up the ethanol percentage to 15% should be a concern to all with older vehicles, as well as those that are trying to maximize their mileage......ethanol is just not as efficient as gasoline. I wrote a letter to the EPA during comment period, and do you think they listened to me....NO !!
The new mandate is now being held up in court by a few organizations that don't want E15 at the pumps.
For those owning older vehicles, be very afraid of anything over 10% ethanol. A valve job may be in your future.
Chap , DW Joy, and Fur Baby Sango
2006 Ford F150 Super Cab 4x4
2008 Surveyor 263