a dyna pack hub dyno is more accurate then most dynos. it has correction factors built in for diff ratio, wheel diameter and wheel weights also.
if anything it might read say higher due to having no wheelspin like you would see on a chassis dyno
EDIT: running 600 cc's... not runing full e85, but if i were i recjkon they might max out. i do however have the option of bumping the rail pressures up.. which would make a difference