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My experience is that if you fill the car up soon after the light comes on you average about 11.2 - 11.3 gallons to fill up. I have gone longer and one or two time got a bit over twelve gallons in the car. Have never gone low enough to get 13 gallons in. I like that the reserve is a decent enough amount to let go a good bit further, but I do also think about keeping the DI in good operating condition by not letting it starve for full fuel delivery at any time. Maybe it is being overcautious, but I just don't see much sense in pushing such an advanced fuel control system into the area where lack of fuel pressure could cause any problems. There will always be a time where you go further than on the tank than would be optimal, but I would never consistently test how low I can take the tank, at the risk of damaging anything in the fuel deliver system. Just my opinion.
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