IIRC Flying J merged/got bought out by Pilot a few years ago.
"Sister" companies. They always been one-in-the-same.
TA is also Petro.
I
think Loves is still "independent". I heard they have a second "brand" but I forget what it is.
The fuel sold at FJ/Pilot, Loves, TA/Petro all comes from the same refineries, of course. I've seen Pilot and Flying J fuel trucks offloading at TA/Petro and Loves, over the years.

Of course the Phillips 66/Gulf/DX/Sunoco/Texaco/etal gas stations and "unbranded" convenience stores get their fuel from the same refineries. My paternal unclehad a 66 station. Not all his fuel deliveries had "Phillips 66" on the trailer or tractor. Sometimes the fuel brand name on the tractor was different from what was on the trailer.
A great uncle had a DX station. I saw Sunoco drop fuel hat his place more than once. (I lived next door to his 4 bay service station in Junior High and High School) Who knows what "brand" fuel they were actually getting?
There MIGHT be different additives in the different "brands", but I doubt it, to be honest.
I forget the name of the refinery in Wichita, KS, when I was there in the 1990's.
I know it supplied the gas and diesel sold at all the service stations, truck stops, and convenience stores ... and probably all the marinas, in at least a 600 or 700 mile (1day's tanker truck's travel) radius.
