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If we're doing the math and look at costs, we should figure up the other side of the equation too. How much fuel do you save? There are more variables on this side of the equation though, rate of fuel consumption at idle, and how much time with the engine off before restarting.
My car uses less than .3gal/hr at idle after warmed up if the SG2 is to be believed or .005gal/min. So if 20 starts on a $40 starter is worth .04gal, 20 restarts has to buy me atleast 8minutes of off time, or 24 seconds of off time per stop
But my starter costs 3x as much, so the only time I should probably be doing it is coasting into parking spots. However that doesn't stop me, I guess I'm abusing my lifetime warranty which got me a free starter this year. If someone couldn't install it themselves it might still not make finacial sense to do.
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