Lately my truck has been burning through fuel like it's going out of style. A few weeks age I took it on a long road trip and it ran fine, but lately the back and forth to work has been killing my wallet. Any ideas why? I plugged in my programmer and no codes came up, so I returned it to stock settings. I also plan on cleaning my air filter, changing fuel filter and even an oil change even know it's not quite time. What else should I do or look into. Any help would greatly be appreciated.

 

Engine? Mileage?