Comment Re:Cold weather (Score 1) 572
But what about the catalytic converter -- that has to be hot before it does anything and I don't think that 30 seconds of running gets it anywhere near hot enough.
But the catalytic converter isn't warm while your warming up, is it? (if it is, why exactly are you warming up?) So it's not doing anything then, right? Might as well be driving - the nominal additional pollutants resulting from higher (driving) RPM on the engine are more than compensated for by getting there sooner and shutting the engine off, when it doesn't put out much bad stuff at all...