Next, we throttled up to a fast cruising speed of about 4,000 rpm and wound the boat into a sharp turn. One of Merc’s new “haves” is Adaptive Speed Control, and with it the boat held its rpm all the way through the turn as we watched the tachometers hold steadily on 4,000. The most experienced captain couldn’t do this better. In speed runs, it exceeded 50 mph and accelerated to 20 in just about 3 seconds. Pretty snappy. And it worked equally well on single applications, like Mako’s 21 LTS and Lowe’s 230 Retreat pontoon.