How could an engine make MORE power using E85 than regular gasoline? My understanding was that engines make about 10% more power using non-ethanol fuel than regular 10% ethanol gasoline, but maybe this engine is different:

Power comes from a twin-turbo V8 that develops 1282bhp… using regular fuel. If you have access to some E85 juice, power increases to a whopping 1603bhp. That thumper of an engine is connected to Koenigsegg’s ‘Light Speed Transmission’ – a nine-speed gearbox which operates without a flywheel.

https://www.carmagazine.co.uk/car-news/first-official-pictures/koenigsegg/sadair-s-spear/