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This year I decided to feed the turkeys sparingly, and let them forage away

They received approx. 100g of 21% protein per day and yielded approx. 4.3kg dead weight

This compares to approx. 200g per day with a yield of approx. 8kg dressed weight

FYI

I'm not sure what this means as you don't appear to be comparing like for like. But, if as it appears a foraging turkey is less than half the weight of a fed one, I'm guessing they're more the size/weight of a bird that hasn't been overstuffed - yes?

I'd be more interested in taste comparison. I'd be willing to bet that the foraging one tastes better.

Both set of birds foraged, but last year I increased the feed as they grew

what it tells me is for every 25g (which = 0.19 cent) per day will give me about a kg of dead weight

I can in theory provide a turkey of a set weight, plan for the cost and predict the profit

Every one needs a hobby

but do you know if the train from New York to California took 20 hours in 1935