Loss of gas milage
I was on a trip of 3000 miles and getting 22 miles per gallon by the computer. Filled up with gas and the mileage went to 19. I thought a bad tank of gas and it would work it's self out with another tank of gas. I have put another 2000 on it and no change and I did put in a can of B & G 44K gas treatment. I was going to change the fuel filter and found out it is in the tank, not serviceable. What is going on with this truck. 4.7 flex fuel eng. I only use 87 octane.