9. Porsche Cayenne V6 : $110.09
Next on our list is the Porsche Cayenne. This SUV has a 26.4 gallon tank. Tie that with the cost of premium fuel and you’ll quickly see why the Cayenne costs so much to fill up. The Cayenne has a fairly average fuel economy rating at 19 mpg combined, so its not a gas guzzler, but the main reason for the costly fill up is the size of the tank and the price of premium.