performance issues

My 2004 Ford Explorer Sport Trac XLT Gas. Has the worst Gas Mileage. I get about 6 to 7 miles per gallon. I have about 156,000 miles on it. Spark plugs pretty new. It drives very smooth and quiet. No engine after market upgrades. No check engine lights. Air filter new . Good pick up but gas...

My 2004 Ford Explorer Sport Trac XLT Gas. Has the worst Gas Mileage. I get about 6 to 7 miles per gallon. I have about 156,000 miles on it. Spark plugs pretty new. It drives very smooth and quiet. No engine after market upgrades. No check engine lights. Air filter new . Good pick up but gas...

I bought my 07 Limited last fall with 192k miles. It threw a P0308 code right away. Ford dealer told me it was #8 coil. They replaced that coil and all 8 plugs. The code returned almost immediately. A shade tree mechanic friend replaced 8 injectors and the code has not returned. Since I...