yep. i had a 50/50 mix and no matter what i did with jetting lean or rich it made very little change. it did like more timing thou and if i would of had more time i would have put more in it. i had this happen one other time with same results,so again if it does'nt need race gas don't put it in unless you like going slow. i wasted $75 on that can of vp. lesson learned for sure this time. i also contacted moneymaker racing(where i bought my cal-tracs) and they don't like that track when the weathers hot,they can't hook there,so maybe that was my other issue. alittle dissapointed,but i'll try again at milan.