posted by justincredible
I can't imagine it's good for the longterm health of vehicles, either.
Depends on the age of your vehicle.
Newer vehicles' fuel lines are different materials that can handle the solvent properties of ethanol. Older vehicles, ethanol at 15% can/will eat holes in fuel/vacuum lines overtime. I have actually had this happen on an old Focus I used to drive.
Basically if your car is equipped to handle "Flex Fuel" which basically means you can put gasoline or E85 in it, then the E15 won't be an issue. If it is not equipped for "Flex Fuel", I would be careful.