In the twenty thousand plus miles I have put on mine, I've only been in 5th a handful of times. Almost never go there.
Really! - a handful of times? . . I'm surprised.
I figure the 336,352 & 365 transaxles are all pretty similar in overall gearing.
In normal suburban driving, I'd be using top gear just to trundle along because it's more relaxed.
That said, I found it difficult to determine what the speeds were in the video, but he seemed to get to a 50 MPH area in the latter part.
EDIT:
One of the suggested videos that came up was this one.
He seems to use 4th a lot too, so I dunno . .
https://www.youtube.com/watch?v=uzLN7g0Jgyw