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 - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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