not buying fuel for your vehicle unless it is from a specific gas station is ridiculous. I'll enjoy the same performance and longevity from the place selling it the cheapest. Your only concerns are correct octane, and is the guy filling the tanks while you are there.
2014 Redline Pearl Jeep Grand Cherokee SRT8
2010 Bright Silver Jeep Grand Cherokee SRT8 (Billet Catch Can, Billet Shorty Antenna, BWoody 4" CAI, Custom CMR Tune)
2013 Grabber Blue Shelby GT500
(traded in) 2012 Mineral Gray Jeep Grand Cherokee SRT8