The muffler is well behind both o2 sensors so I would not think it is that. That said, I do not know what the real theory is either. There are lots of stories on the internet about people paying big bucks for high dollar custom sweet sounding exhaust systems and then their mileage goes in the crapper. I certainly believe that now after experiencing it in an indirect way. (Thank god it did not cost me $700- $900 to learn this invaluable lesson like it does so many other people).
I can only speak of my truck's circumstances but 12.0 to 12.5 mpg highway empty unloaded had me strongly considering a modern 3/4 ton gasser (afterall my truck is 13 years old). My return of normal of 15.7 to 16.5 mph empty highway has me happy to keep what I got especially with new trucks in the neighborhood of $50K.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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