we all agree that warmer engines are more efficient (thus block heaters, grille blocking, higher temp thermostats, etc.).
ODB2 systems also use the signal from the coolant temp sensor to manage A/F mixtures during engine warm-up:
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Injector pulse width is heavily dependent on this sensor, causing engines to run very rich at startup (remember the manual choke?). Fuel enrichment is usually tapered off around 150°F. (source)
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we need a certain amount of enrichment for cold starts, but we may not all need as much enrichment as the computer demands. so what about spoofing this sensor?
has this been discussed here before? has anyone tried it?
the benefits of this mod would be similar to synthetic oil: sensor spoofing or partial-spoofing would only reduce consumption between a cold start and normal operating temp.
a variation of this would also be doable on mechanical/vacuum operated systems.
MetroMPG 
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