Jay,
More often than not, the trouble with fuel tanks is from the inside, not the outside. So, paint quality aside:
1) Keep your car clean. If you use your car in foul weather, and in winter weather, and if they salt the roads in said winter weather and you drive in them, visit a car wash and keep the undercarriage clean. Doesn't matter if that car wash is your driveway. You have to get the grime and salt off the car.
2) Keep your fuel tank full, especially when the car might sit for extended periods. If you "lay your car up" for the winter, about the worst thing you could do is doing it on an empty tank. Fill the tank, add the required amount of Sta-Bil or similar.
You will not have to worry about your car for many years.