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With bigger jet, there would be more pumping losses because of less opened throttle.
With restricted air intake there might be poorer atomization of fuel if air flow slows down.
Basically it is perhaps question which of the two causes less mileage drop.
Of course economically restricting air flow costs nothing while jetting costs same as 2-4 liters of fuel, depending if I would get lucky and get it right at once or at second try.
Difference probably is so small with two methods that even if jetting would be better it would take forever to actually it to pay costs of jets back.
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