Sure you can.
There's more nonsense out there now than when I began, and you've been in this game longer than me.
The magazine writers just regurgitate what they are told. Very very few have even heard of Larew, Taylor or Obert. Never mind knowing what research information is in their books.
When that 'rule of thumb' works, its just dumb luck. At least the rule of thumb based on highway vacuum has some logic behind it.
The right way to know when an engine's part throttle load is such that it needs to go richer is by testing when the combustion changes. Since most of us don't have that sort of equipment, we have test in more practical ways. Anyway, getting way off topic and covered this in other threads.
