If you're really getting 22 MPG, you're getting about as good mileage as any 6.2.
If anthing, if you totally unhook the EGR system, you might get a slight improvement - but NOT just by unhooking the hose from the EGR valve in the intake. There is an EPR valve (exhaust pressure regulator) that controls a shutter valve in the driver's side exhaust manifold. It restricts the exhaust on that side to divert it up to the EGR in the intake. If all you do is unhook the EGR on top, you still have that shutter retricting the exhaust. Unhook the line to it and tie it open with a piece of wire.
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Today's Featured Article - Tractor Implements and Their Use - by Curtis Von Fange. Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he reached his early sixties
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