I use BP gas quite a bit. Primarily because it's the gas at which my Harris Teeter groc. store Fuel Points can be used. Average 30-40 cents off per gallon, per month. And price wise, BP right there with the lower/lowest price gas.
Now I know they dropped off the Top Tier gas listing awhile back, but recently read BP says they use their proprietary "Invigorate" additive package. I'm speculating perhaps same TT gas as before, just don't want to pay to be part of TT listing. Anyway, as long they participate in Fuel Points, I'll be buying BP gas when I have accumulated points. Also use Gumout Regane HM CFSC every ~3k miles, just as a fall back.