Yes, I know. It wil be very hard to convince the EU of that problem so I think the fuels will stay (illegal) at 16% by volume. And if not, we will adapt, no problem there. In the past we all have breaked in our engines with just 5 or 10% nitro and raced with the left over fuel.

Yes, the temperature with 16% did raise something but not important, the current high timed engines do get hotter than the stock and older ones, if I modify a 35plus21 then the temperature has raised with 10 to 20 degrees celcius and my engines have no problem with that.
Performance wise you can feel a milder throttle reaction but when everyone has that it is no issue. And in the onroad still new laprecords are made on just 16%

And to be honest, 16% was in the onroad 25% era already well used to get a better milage if it could not be done with 25%