i have always thought that 1/4 is 1/4 there even if its the first 1/4 or the last in the tank. Now that my guage is exactly on 1/2 Im going to try to pump say- 5 gallons, and see how far it gets me. Then ill pump 5 gallons when i have 1/4 tank and see how far that gets me. I will be very surprised if the two numbers are significantly different. According to yall, there should be no difference and none of you have experienced any difference either correct? i was thinking fuel pressure might have something to do with it??

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1985 300SD- 212K and running