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I'm sure that would depend on too many factors for an universal formula. It would be like trying to make a formula for how many miles you could drive all a car on a full tank. Different engine sizes use more/less gas. Quality of fuel, air to fuel ratios, oil pressures, humidity, work load and all kinds of other things would come into play. And by this I mean the engines in the generators not a car. Don't take my word on it though I have only limited experience with those things.
My bad, I think I miss understood the question. I thought he was asking about more of an universal formula not one for a specific machine. I'm sure with the specs of a certain model you could figure it out. Oops