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I agree that you do have to get the EGT gauge fixed to properly lean per the POH, but if you are coming close to leaning both engines per the POH* , my main concern is that the 3 gallon per hour difference may be a problem far worse than unbalanced leaning. You might have a tank leak or, even worse, a leak elsewhere in the fuel system. I would have this looked at ASAP.
Ernie
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* Coming close is doable even without an EGT gauge by an experienced pilot, familiar with both engines, using the standard fuel flow gauges, relying on the roughness that accompanies peak EGT, and then enriching from peak EGT by the same flow rate needed to enrich the other engine after its peak EGT.
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