Just replaced my old 06 RTL with an 06 RTS. The old truck had aggressive cooper discover tires in it and I was lucky to get 18mpg on average. The new old truck has Walmart specials that are more like and SUV tire and I have averaged 22 on the last two fill ups. Although in heavy rain the other day those same Walmart tires were sorta squirrelly. Dextro is the brand. They came with the tuck.