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HELP - High fuel consumption
I am at 1600 miles of a 2600 mile trip from VA to OR. I picked up a 35' horse trailer (less than 10K weight) at around 500 miles. (some background).
At around 1400 miles in the trip my fuel consumption became drastically worse. For example, I am now at around 100 miles per 30 gal. of fuel.
Air filter was cleaned well before the trip. Fuel filter replaced at around 1500 miles in the trip and changed again today by the dealer (it had less than 100 miles on the new filter).
The dealer found code P0263 and replaced defective injector #1. They also found P1211 and cleaned the fuel pickup screens. They cleared codes and retested.
So I hooked up and pulled out. Within 10 miles I had codes again along with loss of power under load and some other issues with the engine. I turned around - while waiting on traffic, the check engine light went out. Pulled back on the interstate and everything was fine until I pulled a hill. Then the check engine light and loss of power. I should also note that 70 miles ate up almost 1/2 tank of fuel.
There are no leaks - fuel or otherwise. Truck runs like heck with no load.
So I am back at the same hotel waiting till morning for the dealer to open and start over.
I would appreciate any insight someone may have that could be causing or contributing to this issue. I do not understand where the fuel is going. I do not notice any smoke from the exhaust (white / black or otherwise), however , that does not mean that there is some and I just cannot see it.