“ $8.59/gallon” (pump shows price as $8.59.9 / gal).
This was one of my father’s pet peeves — someone would say “The Sav-A-Lot in town has gas for 39 cents a gallon”. And he would say “no, it’s 39 and 9/1oth cents a gallon.” And he was right. You may as well say 40 cents. Or in the case of this article, $8.60/gallon.