I just realized, you have a positive displacement pump in your diesel. You can probably make a good guess at fuel consumption based on the throttle position and rpm alone, as long as you leave the smoke screw alone
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A couple years ago, on the diesel, i mounted a thottle positon sensor on injector pump linkage. so at a given conditions, i can read the resistance change and get a relative number to comparing mods. i test both directions on the same road at 55mph.