I think I see where your going on this one, but unfortunately the EGT won't be a direct correlation of your MPG, because the regestered EGT is more a function of load and not necessiarly speed. Of course its an indicatior, but one involving many variables. It sort of stands to reason that the smaller amount of fuel burned the lower the EGT, thus better MPG, but how you gonna make use of the data collected without knowing the rest of the story?
02 2500HD LT D/A SB CC 4X4 BLACK, Westin stainless nerf bars, BW GN Hitch,Racor 60S post oem fuel filter, Oil Guard bypass engine oil Filter. All synthetic fluids. Kennedy boost valve, edge, Modified air intake,EGT & Boost digital gauge,TransferFlow combo fuel & tool box, Air Lift Suspesion Bags Rear & compressor with remote, Bilsteins front & rear, Frontier front replacement bumper.