I don't look at where the needle is exactly when it gets below the half way mark on the gauge. I look for when the needle quits wiggling from the sloshing gas. Once the needle stops moving, I know that I have about 30 miles of gas left, give or take and annoyed friend or two.

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission