Mine was always within 1/2 gal on a near full fill for the first 5 years. After that, it started to slip a little. About 6-1/2 years into ownership, it crept its way up to a full 15% off. Also started to have the notorious injector issues. New injectors on the General, and WOW! My DIC is again accurate. How are you injectors? From what I have read somewhere, the DIC calculates fuel used by monitoring the volume commanded and tantalizes all those little squirts. If your injectors are squirting more than they are commanded, the DIC will show less fuel used than actual.
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