We don't just check at WOT. We have charts and records at all rpm's and speeds including fuel consumption. So when we open both engines to a particular rpm we know what speed to expect. Now we also do open to WOT at least once most days we're out. The exception is when conditions are too rough. We learned long ago on much smaller, faster boats to keep an eye on max rpm's and look for problems or changes. It's not the issue of going fastest but simply that WOT gives you the quickest indication of what is going on. It's an easy objective measurement. Honestly, we haven't had a major problem with tachometers.
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