As I was near a Morrisons over the weekend, I thought I'd stick a gallon of E85 in (to 10 gallons of V Power already in the tank) to see what happened.

It was a bit irritating filling up as the E85 pump at Ipswich is horrendously slow for some reason, but anyway, EGTs fell 50 degrees and I was able to add 4 degrees timing on boost without any det. The engine felt smoother too.

That was with just 10%, imagine what you could do with 100% E85!

10% Biofuel in petrol only needs 6% lambda enrichment to achieve the same target AFR, so is the safe limit for playing around with. Stronger blends will need bigger injectors and the AFR run at 2 points richer unfortunately, but it's encouraging!

Someone on the DTA forum has had injector O rings, injectors and a pump submersed in E85 for a year and there's been no chemical reaction so far. I know normal ethanol attacks alloy and rots some rubber hoses, but Bioethanol so far seems safe. Happy days!