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Joined: Jan 2008
Posts: 39,997
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From: Maine, Virginia
I just push the button as soon as we take off. But yes, creeping forward will keep it running as well as a slight turn of the steering wheel.
I've tracked my mileage both ways and I think it's a load of crap that it saves fuel beyond a negligible amount. I've seen Ford techs online swearing for it and about it.
I've tracked my mileage both ways and I think it's a load of crap that it saves fuel beyond a negligible amount. I've seen Ford techs online swearing for it and about it.
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Joined: Apr 2004
Posts: 34,470
Likes: 2,799
Short version:
--must be off for 7 or more seconds to save gas as it takes 7 seconds of gas at idle to start the engine. (count it out--not a lot of 7 second stops most of the time)
--EPA mileage tests are said to gain 1/10th of a MPG. This is also reported by independant tests
--My cousin has a Subaru Crosstrek. He's had it about 18 months. The meter shows him how much time off due to AS/S. And how much gas saved. He's saved about 1.5 gallons.
I know that the computer calculates that but I wonder if it takes into account the 1 or 2 second stops that actually increase gas usage. (stop for 2 seconds, use 7 seconds worth of gas to start)
I just hit the button as part of the start up routine, just like checking the AC and radio volumn.
YMMV.
--must be off for 7 or more seconds to save gas as it takes 7 seconds of gas at idle to start the engine. (count it out--not a lot of 7 second stops most of the time)
--EPA mileage tests are said to gain 1/10th of a MPG. This is also reported by independant tests
--My cousin has a Subaru Crosstrek. He's had it about 18 months. The meter shows him how much time off due to AS/S. And how much gas saved. He's saved about 1.5 gallons.
I know that the computer calculates that but I wonder if it takes into account the 1 or 2 second stops that actually increase gas usage. (stop for 2 seconds, use 7 seconds worth of gas to start)
I just hit the button as part of the start up routine, just like checking the AC and radio volumn.
YMMV.
Tuned
Joined: Jul 2022
Posts: 333
Likes: 60
Very user friendly, and as long as you follow along with the video above you shouldn’t mess anything up. The biggest thing is saving backups.
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5th Wheeling
Joined: Jan 2012
Posts: 49
Likes: 9
Does all this only apply to the ST? I have a base model. I do have forscan, but the video is also for an ST.
Last edited by 67galax; Oct 19, 2025 at 09:29 AM.
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