Arco is perfectly fine for gas. Shell on the other hand I refuse to use. There was a special on CNN a year or so ago and they revealed Shell use some of the lowest quality oils for there fuel. May have changed since then, but still not interested. I will stick with Chevron.
Thunderbird Family -
93 Thunderbird LX V8 Mods:Blaupunkt Bahamas MP46, Blaupunkt GT Speakers, Blaupunkt 12" Sub, K&N Intake, Taurus Cupholder, MSD Cap, Rotor, Coil, and Wires, Bosch Super Copper Spark Plugs, Bosch Battery, 93 SC Rims W/Fuzion Tires
87 Thunderbird Sport V8 Mods:Blaupunkt Bahamas MP46, Blaupunkt GT Speakers, MSD Cap and Rotor, Autolite Platinum Spark Plugs, Bosch Battery