..Costco announces slowdown in gas sales? My "back of the napkin" calculator of the Costco gas sales near my house; 10 gallons per customer 1 customer every 5 minutes 16 pumps 16 hours of operation equals 3072 customers per day and 30,720 gallons of gas. If all of the 15,000 current Tesla 3 owners who previously gassed up, lived by the same Costco that would equal 5 days of lost customers. and at an output of 3000 3's per week that would be equal to Costco losing one day of customers every week. this doesn't include all the existing Tesla models and all the other EVs on the road today.