I am off highway streets about 75% of the time for the type of work I do. I am in the oil and gas industry and in the dust and mud constantly. With the amount of wind and dust that we deal with on a daily basis, the dirt does pile up around the fuel filler. Just imagine the vent that was put in the wheel well. I can't miss work by constantly having my truck in the shop. They re-routed the vent to under the hood. On why it cost so much? I don't know.. I have looked at all trucks now and only the Toyota Tundra and the Nissan Titan have gas caps still. The Ram, at least, has a sealed compartment for some of their models.