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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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