While you are right with all the years so far, the fuel regulations recently changed. From 2022 its a prescribed E10 fuel:Tommy Cookers wrote: ↑Fri Nov 27, 2020 10:59 pm(lots of posts mentioning E5 and E10 .....)
the rules don't require bio-ethanol - they require a bio-ingredient
I wonder why would anyone now or ever use bio-ethanol ?
haven't Honda been using bio-butanol ? (as per their articles in the Japanese press)
ethanol's mass-specific energy is very poor - butanol's is much better (much closer to gasoline's)
the rules mention 2nd generation bio components and advanced sustainable components (possible carbon capture/reuse)
they don't mention E5 or E10 or ethanol - and they never have
From the 2022 Technical Regulations:
Another big change is expected in the fuel from what I've heard in that the new PU regulations will require a 100% "advanced sustainable" fuel - so all components from carbon capture or non-food source biomass.16.4.4 A minimum of 10% (m/m) of the fuel must comprise advanced sustainable Ethanol
For the current fuel though, I completely agree. The reduced energy content of ethanol makes it a poor fuel in a fuel flow (read energy) limited formula.