318 MAX fuel economy builds?

I developed an electronic circuit I called the IATimer that starts out
"not there", then gradually ramps in (adjustable ramp time and final offset value) to an offset of the IAT Sensor value for advanced/retarded ignition timing. A similar ramp circuit could expedite the ramp-in of the coolant temp. This version definitely requires electronics & programming skills. Not sure how to do it with junk yard parts, though. I'll give it some thought.