It is variable but 50 miles is typical.
Personally, I start looking for gas when the tank gets down to 1/2 and get serious when it gets down to 1/4. Besides the stress on the fuel pump of running the tank too low every once in a while I can't get gas when I want to... all sorts of reasons from widespread power outages killing all the gas pumps to not being able to get the fuel door open or the gas cap off. When that happens it is nice to have some more driving time.
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