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Not an expert but:
At idle my car uses 0.2-0.3 GPH, at full throttle it uses 3-3.5 GPH. A look at the replacement fuel pump for my car shows a pump output of 7 GPH. So the fuel system should be designed to return anywhere from 4 gph all the way to the full output of 7 gph back to the tank depending on what the fuel injectors use. I can't see how the fuel return system sending 6.8 gallons back to the tank at idle and 7.0 gph back to the tank during DFCO should make any difference.
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