There was quite a bit of discussion on this very subject on this forum way back, many members contributed their numbers. Everyone had similar experience, myself included, but there were times when I actually pumped so much gas when added with estimated fuel in Hummer, total came up to over 31 gallons.
I did find on several occasions, once the auto pump jumped, I kept on manually & slowly pump in gas, I added over 2 gallons after automatic pump will not pump.
Things sort of settle down, smooth and even out once you add some miles on your Hummer. MPG somewhat improves too.
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