manboy.. Nothing deep here, the truck really does get that gas mileage, you can come check it yourself. It has 3.73 gears, and the 33s raised the gear ratio a little bit more, so out on the highway it does get really good gas mileage, I dont claim to get that mileage while towing or around town, but Ive checked it a number of times and was surprised to find out myself but its true. In town and towing it drops to about 15, but still not bad for a fullsize truck with a v-8. It is also a standard cab truck with a 6 speed, more factors to help gas mileage, along with K&N filter and Flowmasters. So no,, nothing "deep" here.