Be glad he didn't accidently read the spec from a Lexus LS 460. Or you would have wound up with 9.2 quarts I think it is.
When I was in college, one of my buddies managed a quickie oil change place. I bet this happens occasionally, but he said a lady came in just blowing clouds of smoke. She said she just checked it and added oil. He said how much. She said til it was full.
I don't blame anyone for making that mistake. You don't know what you don't know, but at least she was trying to take care of her car. Which is more than I can say about a lot of ... people. He was very nice with the same attitude as that, and drained and filled it correctly for free. He warned her that it would continue to smoke for a while, and said it smoked (not as bad) for as far as he could see her drive away.
View my fuel log 2020 Mirage ES 1.2 manual: 42.4 mpg (US) ... 18.0 km/L ... 5.5 L/100 km ... 51.0 mpg (Imp)