I agree with the first start idling for a few seconds thing... Once it got cold this winter, I noticed I couldn't just start and go anymore - the car dies, I have to use the starter again, which totally ruins the objective of saving fuel. When it's below 0 C outside, I've decided not to P&G for the first 45 seconds of drive time, after a ~15 second warm-up.
When it's hot outside, I can probably get 2 miles with a minute of engine run time.
