If I buy an E20 vehicle now, will it support E27 fuel, just like our E0 vehicles supported E10 fuel without any issues, if I am correct?

One way to think of it is that it's just 7% more ethanol, so the E20 car should be able to support it.
Another way is that something above 27% overall, which is huge.

I know no one has a clear answer, but let's discuss. Maybe we can get some internal information.