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 - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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