I worked for over 10 years in the warranty department of a major tire manufacturer. The problem isn’t reading comprehension. The problem is not reading the warranty at all.
I have a theory that many people don’t comprehend things by reading. They are best at verbal communication (which is the opposite of what I and apparently many people here are like!). Some others have to do physical labor to get it.
Hence, the textbooks, lectures, and lab approach to education.
In the case of warranty, the law requires that it be written down, but the average consumer wants it said to him - and the average sales guy isn’t very good at explaining things. He is good at persuading people. Ergo, the problem is unsolvable.
And don’t get me started on folks who think the problem is the education system.