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My guess is they are doing it for emissions and/or smoother operation of the auto start/stop.
The minute gas mileage benefit is likely offset by the added weight - 50 pounds or so? Sure, 11 hp and a little bit more torque is nice but I don't think it will make a noticeable difference to the average driver on a car that already has almost 400 hp.
If mine comes with it I likely will keep the car in Sport Custom mode for city/interstate driving anyway - I hate the auto start/stop.
On my Ridgeline, I never got in the habit of pushing in the button so I found a trick with the truck bed power outlet that turns it off - and keeps it off.
Some bright guy/gal or aftermarket company may come up with a trick for the M240i too.
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