Quote:
Originally Posted by Bicycle Bob
When one of the car magazines got serious about getting 100 MPG by driving technique, they found that the car used a shot of rich mix to start, equal to about 30 seconds of idling. It takes a strong starter, and usually some fancy mixture control to come out ahead on this. Measures to keep the oil pressure up are also needed to avoid a false economy.
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There's another study out there that says 7 seconds.
Here's one link, there's a bigger/more detailed article somewhere else - but I can find it now.
IWillTry.org How many seconds of idling is equivalent to starting your engine