Being the son of a mechanic, I have never let a truck get below 1/4, and the one time that I did, I ran out of fuel with my new born baby in the truck. Lukily I coasted into the station, but I realized the mistake I had made and why my dad always told me to fill at a 1/4.
I know this doesnt really help your situation, but I would just fill up at 1/4 if I were you.
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