The manual says not to use e15. Voids the warranty. Look at your car manuals, not some guy on the internet. That was the point of the post.
A flex fuel vehicle is capable of using E85, you’d previously stated the Kia “wasn’t a flex fuel vehicle and therefore couldn’t use E15”, which is what my statement was based on, I thought you had the two confused. If the manual says no E15 so be it.
The warranty will be voided if they test the fuel in the tank and it’s over 10, so in general your source better be on top of their blending game...