How ARCO fuel pricing works
ARCO has built its brand identity around being consistently cheaper than nearby competitors in West Coast markets. The discount typically runs 10 to 25 cents per gallon below local average retail pricing. ARCO accomplishes this through a few structural choices: most stations charge a small fee (around 35 cents) for debit card payment to offset interchange costs, the co-located ampm convenience store generates additional foot-traffic revenue, and the parent company's refining scale (Marathon Petroleum) provides cost-advantaged supply. Stations are independently owned and operated, with Marathon or BP (depending on region) supplying fuel and licensing the brand.
ARCO history and the dual-parent setup
ARCO stands for Atlantic Richfield Company, formed in 1966 from the merger of Atlantic Refining Company and Richfield Oil Corporation. BP acquired Atlantic Richfield in 2000 and operated the ARCO brand on the West Coast under BP ownership until 2013, when BP sold most of the ARCO retail network and the Carson, California refinery to Tesoro (later renamed Andeavor). In 2018, Marathon Petroleum acquired Andeavor, taking over ARCO operations in most US markets. BP retained an exclusive license for the ARCO brand in Northern California, Oregon, and Washington as part of the 2013 sale, so in those three areas the ARCO brand operates under BP rather than Marathon. From a customer perspective, the station experience is identical regardless of which corporate parent operates a given ARCO location.
Top Tier status and fuel quality
ARCO is on the official Top Tier Detergent Gasoline brands list. All ARCO gasoline grades carry the Top Tier additive package across all stations. This is meaningful because budget-positioned brands often skip Top Tier additives to lower costs. ARCO's combination of aggressive pricing AND Top Tier fuel quality is unusual in the value brand category. The fuel quality is comparable to Chevron, Shell, Exxon, Mobil, and other premium-positioned brands.
ARCO and the ampm convenience-store partnership
Most ARCO stations have a co-located ampm convenience store. The ampm brand is owned by the same parent (Marathon, or BP in the Pacific Northwest) and is positioned as a quick-service convenience-store anchor. The dual revenue stream (fuel margins plus convenience-store margins) is part of what allows ARCO to maintain aggressive pump pricing. The ampm brand's tagline (Too Much Good Stuff) and product mix (hot food, breakfast burritos, large beverages) target the same value-conscious customer ARCO attracts at the pump.