Typhoon Most gas stations today are such high volume that they are getting a load every day if not more. This was my business before I retired.
Also, he’s right that if you sell below your replacement cost, your bank balance will go down while you incur taxable profits. Lose lose.
Generally gas stations get pinched when prices are rising, and make extra when prices are falling. Because the street price is the last thing to move, believe it or not.