I've found that my laptimes while racing virtually do not fluctuate that much between being sober and a little bit wasted. In fact I have posted some of my best times while under the influence. How about you?
My lap times usually improve a bit after having a couple of beers - but after a couple more they increase (if I'm able to get around without crashing).
Sometimes i play to GTR Evo after a lunch where i drink 1 or 2 glass of "good french wine" :good:, and i have to admit that i'm more attentive, more concentrate, i'm zen :glasses-cool: