The claim has always been (at least that's the way I heard it) a tenth for a hundred pounds. So theoretically, you should have picked up . 075. More than that, maybe due to more cold air. Less than that, maybe look at your mph, drag from not having a hood might show up there.
(I'm curious what "significantly" is?)
Edit: did they make you run something over the carb? I was told that since I also run with no hood, I have to run an aircleaner or scoop or something, assuming for a carb backfire, I guess.
