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 - Machine Shops - by Curtis Von Fange. It is a story that repeats itself countless times. In the process of rebuilding a particular section of the tractor there is a broken part for which a replacement cannot be found. The parts houses find in their catalogue that it is unavailable. The dealerships call it a discontinued part. Salvage yards define it as hard to find or, even worse, rare. Everyone on the NET says, 'what is it?' But don�t despair there is another avenue that can be used to get that piece repaired. The local mach
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