Maybe, if the car’s owner did a lot of running out of gas. But how would a low fuel light prevent that? (I can see that it would slightly reduce the number of people who would let the car run out of gas, but it no way would it prevent it.) The car I drive has a warning chime that sounds every few minutes once it gets to 50 miles to go. It also has a display of remaining miles to empty. The newer version of it also automatically switches to map mode and displays the nearest gas stations, complete with gas prices. Even with all that, I still hear of people running out of gas.