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Factory calibrations are compromises, but they are darn good. This is not counting derated engines for chassis cabs and such. Which I never understood.
Before you go to hard on me, I am currently fiddling with a Ford engine. So far all the usual power tricks, aside from ignition timing, makes it run horrible. Took forever to figure out to adjust timing. It has 4 spark tables, 4 spark modification functions (2 for ECT and 2 for ACT) and two global modifiers. Adding fuel makes it run bad, with poor economy. My best so far is actually leaning it out a tad while advancing spark.
1977 Cherokee S, Ford 5.0, 5 speed, BW 1356, 33 x 10.50 BFG's. No longer my DD.
2007 Mercury Milan, 2.3L, 5-speed, now my DD. 29 mpg average.