Would you say it affects it enough to say it runs like crap? Doubt it.
I would say a bad tank of gas is more likely a culprit. I ask about gas because apparently a company with a 94 octane gas is making cars run worse than a 91 octane. The 91 not containing ethanol and the 94 having the additive. As mentioned previously in this thread.
Don't tell my Mother I'm a pilot.... She thinks I play piano at the whorehouse...