When I bought my pitbull in '05, I also had a ridiculously small reserve, less than 5 miles. I finally figured out what the problem was a few years ago. This may not be everyone's problem, but if you have a small reserve, it is definitely something to check. The fuel line from the factory is a little too long and it was curling up between the tanks. My pitbull has dual tanks, but this would hold true for one piece tanks too if the fuel line is sticking up in the tank tunnel. No part of the fuel line can be above the bottom of the tank. If it is, fuel will not fall below the highest point of the fuel line, and you will be out of gas, even if there is still a half gallon in the tank. I shortened my fuel line, and I can go much farther on reserve. I'm not sure how far I can make it, but I did make it about 20 miles to a gas station on reserve once. Maybe this will help someone .