I somewhat agree, but also disagree based off my past experiences. For power, I agree, its negligible. However I've had 2 vehicles in the past, an 09 focus 2.0 (na) and our current 11 escape 3.0 (na) where all i did was install a better flowing filter, and on both vehicles, saw an increase in mpg, 3-mpg on highway in focus, and a hair over 2-mpg for the escape. I eventually got tired of cleaning and oiling the filter in the focus and went back to OEM filter, and mileage dropped back right at 3 for our road trips. This is all hand-calculated and an average over lots of fill ups, I am religious about setting tripO every fill-up and driving to a specific miles to E (obviously this will be slightly different each time based off proximity to my fuel station). But power-wise, never measured with a dyno, never really felt much with the seat of the pants either, maybe just a hair better at passing on interstate, but agreed, no real power gains from drop in filters.