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I wouldn't think it would result in much of an improvement in fuel economy. Your oil pump still has to force the oil through the engine and that pressure is going to make the oil filter pressure drop pale in comparison. Also most engines have a bypass valve that allows the oil to bypass the filter once the pressure across the filter reaches a certain limit.
I would think that the better filtration would lead to reduced wear on the engine. This better protection would keep the engine running better for a longer time and that would in turn improve FE.
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