Side note, not too many owners dare to learn the vehicle capabilities and average driver fills up with 1/3 of the tank full.
I am the one who hates to spend time at gas stations unnecessary, so most of the time test new to me vehicles.
Modern diesels don't like to run empty, but I have not had a vehicle who would not make at least 50 miles on reserve, while old VW diesel pickup would make 150 miles with fuel gauge firmly on 0.
Bare in mind that with camper hauling the range shrinks.
Driving often via deserts, I like to carry small can of fuel as mind quieter.
Driving with reserve light is a bit of nerves wearing, while spare can allows you to use full tank capacity without a stroke.