how does auto stop/start save me 1 mile of fuel every 3-4 seconds?

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Everytime the engine turns off in my 2022 Nissan pathfinder the timer continues and every 3.5 seconds on average the total fuel saved goes up by 1 mile. I know this because it has a timer that continues everytime the engine turns off. Currently it reads 13 minutes and 21 seconds off and 227 miles of fuel saved

How am I saving 1 mile worth of fuel every 3.5 seconds? I get 16.3 mpg and 18 mph on average after I’ve driven 2500 miles

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