Many BMX bikes come with the tiny sprockets and cogs. Like 25/9 and such. Yet a bike can have essentially the same overall ratio with larger sprockets. Like 44/16 or such. Laboratory tests have shown that larger sprockets are more efficient. My question is assuming the same (or very close) final ratio, would you be able to "feel" the difference on a test ride of an otherwise identical bike? Or measure the difference riding a set course?

Have you ever actually tried this in real life? Thanks.