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it depends how you drive the car
if you accellerate agressively all the time, warming it up will save you fuel.
if you drive the car gently all the time (or at least, when its cold), warming it up won't.
The o2 sensor (assuming it's newish and in good order) is warm enough to be working within the first 30 seconds. It's not the issues.
Fuel mapping with cold coolant IS, and if it's cold out the injectors are DUMPING fuel. I would think with the coolant at -40F, if you were to go WOT in a TII you'd run out of injector pulsewidth with stock everything well before redline. Cold engines need a TON of fuel to operate smoothly.
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1992 skyline
and lots of rx7's.
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