Seems like it's luck of the draw. I have just over 150,000 miles on mine and have had an Edge Comp on there since around 42,000. I always try to fill up just below 1/2 a tank but I have gone down to the almost empty mark a few times. I add fuel additives but didn't in the first 60-80,000 miles and sometimes don't have it with me when I fill up even now. I think one of the biggest things for the VP is heat, if you do alot of short driving they tend to die. I drive 50 miles one way to work and let it cool down be for shutting it off. Keep the inlet pressure up and that will help the most, try to keep it above 9 under all circumstances.