but nearly everyone I speak to is doing substatially better with their trucks
Sure, we all get 20 mpg towing and 30 mpg empty. It must be the way you drive. :-laf :-laf
Sorry, but thats a real common response.
There are a lot of variables that determine mileage and it differs from truck to truck. IF what is posted can be believed, there are huge differences between the exact same optioned vehicles. Which one is right? Were did the numbers come from, overhead or hand calc? What were the conditions? How long the trips? etc, etc, etc... ... ...
I have seen worse numbers than yours with my relatively stock height truck. I have also seen better. The 14 on the highway sounds low, but, how long was the trip, what were the conditions, etc, etc, etc... ...
If you suspect a bad injector an oil analysis will tell you if it is getting past the rings. If it is injectors just hanging open too long, well, there are tests for that but can you trust the tech to interpret them?
Dealer will tell you its normal, from my experience and no more info than you posted it sounds in the ball park. Good luck.
