Heat and Humidity can make a large difference. Also, did you run any different accessories this time? I know right now it is hotter right now, did you notice your engine temp this time and last? Not only will warm air be less dense, but it will effect the cooling of your car too. So add 20 degrees of heat to the engine(that takes 3-7HP from the block) and the fact that the air is hella humid and hot allready. I bet that could have added almost half a second to your time. Where did you go by the way? Unioin grove, or 66?
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