the.com/exhausted
Running on fumes the tank stopped offering an hour ago.
means So drained of energy or resources that continuing feels physically or mentally impossible.
from From Latin exhaurire, to draw out completely — as in emptying a well bucket by bucket until nothing rises but mud.
Car connectionSame root names your engine's exhaust pipe.
Resource senseMines and topics get exhausted too, not just people.
Total by designThe ex- prefix means out, drained to nothing.