Now I know where empty is!

That's what I did to find out exactly where it runs out of gas.
Kept a two gallon jug in the trunk until I ran out of gas
I did the same thing with the old sender and ran out on the interstate, at speed, going up hill in a construction zone with cement dividers on both sides of the two lanes. Coasted to a small break in the deviders and yanked it into the dirt which was mud a week earlier and now was like cement, thank goodness for mopar K members