I came up with this a while back, if you’re a visual person. It’s helped here.
MRP - Min max and safety in Epicor.pdf (540.4 KB)
(These are actual numbers form my “lunchbox” - aka Scion xB.)
In non-Epicor terms, low-fuel light is “time to find a cheap gas station” and the reserve amount of 2 gallons is for if you’re going from Tampa to Ft. Lauderdale on that highway with 30 miles between exits and your stubborn self decided to keep going after you passed the last gas station, holding out for a better price, not that I have ever done that in the pouring rain…