just want to add, that the 550 number was a guide to fly figures as any,one who has read my post will understand, as my readings are HUB figures and fly will vary with losses.

as for more, well i have done testing with E85, and seen 40 ish bhp gains. so if anyone has done tests with the YB to this spec on E85, and found differently. Your views are welcome..

Night night...