Honest question: how do you all sense when a page is AI-written? To me, the many headings, lists, and frequent use of bold stand out stylistically. Additionally: the multilevel numbered table of contents; the parenthetical acronyms (to the point of silliness, as in "Frequently Asked Questions (FAQs)" stand out.
Non-stylistically, the non-answers to questions or misinterpreted questions (read the bolded final sentence under "What is the octane rating of synthetic gasoline?") are a tell.