I use EXXON/Mobil diesel because it's the least expensive reputable chain in my area and has discounts as from the grocery store points.. Had troubles with contaminated fuel at the independents and small chains over the past three decades.
Gasoline, I've been using the E/M because of the points savings, but Royal Farms is even less expensive plus has additional points savings, so I tried it and it runs the same in the Beemer. No brainer, cheaper, car runs the same, use it.
P.S. Don't argue with the nitpicky trolls. They just need attention because mommy won't give them more potato chips.