As counterintuitive as it sounds, EGR actually has a cooling effect on the intake charge:
"EGR has been successful in reducing NOx in gasoline engines. When an engine uses EGR, a percentage of the exhaust gases are drawn or forced back into the intake, at the direction of the engine's electronic control module (ECM), and mixed with the fresh air and fuel the engine is ingesting.
"The purpose of using EGR is to lower the peak flame temperatures inside the combustion chamber. Forcing some exhaust back into the cylinder slightly reduces the concentration of oxygen and slows the burning a bit, making things a little cooler. EGR also absorbs heat, further cooling the process."
So eliminating your EGR will probably increase combustion temperatures within the cylinders. But it may come at a price, as your engine may actually run hotter...and any tiny MPG increases MAY be offset by evaporative losses. Or they may not.
The two largest factors on MPG are vehicle weight--which you may not be able to affect significantly--and final gear ratio. If you already have a 700R4 overdrive automatic [0.8:1 overdrive ratio] and a differential gearset lower than 3.30:1, you may have already seen all the MPG you're gonna get from a vehicle that weighs what a Suburban does.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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