Some additional info would be helpful. How big are your tanks and how far down are they when you fill them up? A 5% delta in fuel consumption between the engines would not be a concern. 20% would. When you say 22-28 gal difference, I assume you have filled up more than once - same fuel dock? Clogged or constricted vent on your tank could cause the fuel hose to shut off prematurely, though odd coincidence (as would be the return lines, but agree with Sunchaser its a worthy exercise).
What prompted the motor mount/prop replacement?
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