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Get your scanguage to show when your in open/closed loop. See how long it takes after bump start to go back into closed loop. If we "ass-u-me" that open loop produces 4 times as much polution as closed loop and it takes 5 seconds to go back into closed loop then we need to be shut off for more then 20 seconds to produce less pollution. That's why the "rule-of-thumb" don't shut engine off at light if it will only be off for less then 10 seconds.
The one I violate all the time is going for a drive to hypermile to get this tank average up when I don't really need to go anywhere. I.E. bad day to/from work only got 42mpg so I go for a 50mile round trip to get some dinner that averages 60mpg to bring days average back above 50mpg.
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