The higher gas prices go, the more the math on a Costco membership starts to make sense

Drivers fill their tanks at a Costco gas station in California as fuel prices rise amid the war with Iran. Frederic J. BROWN / AFP via Getty Images Average US gas prices topped $3.60 this week after Trump's war with Iran disrupted oil supplies. Costco, meanwhile, sells gas about $0.20 per gallon less than nearby stations. The wholesale club's price advantage can be bigger in areas with relatively high gas prices. President Donald Trump's war with Iran is disrupting oil supplies and sending ...