Originally Posted by TLyttle
Sure makes you wonder what the engineers were on when they designed that head, doesn't it? Would they purposely design it to get such poor performance, including mileage?
Remember, a truck will have different operating parameters than a car. The truck is more of a torque animal designed to carry heavy loads than a horsepower animal. The head design assists with torque, and emissions. Opening up the head to more flow may/may not upset the torque balance and emission goals. It depends on how the head is worked.
I had a 99 auto and it got 21.5 mpg. It was a short bed, standard cab.
jd