Driving on the freeway in 3rd gear in an automatic transmission vehicle

The owner’s manual usually says how long one should avoid running high rpms during the first 600 miles or so. You should look through it if you haven’t already.
I dunno about Toyota, but Mazda has it where I can download a copy of the owner’s manual from their website and keep it on my computer for reference or even printing out should I desire. This might make it easier for you if you have a Kindle or iPad type e-reader that can read PDF files