Hmmm...Except, well.. is isn't really a "4 place aircraft" in the real sense of the word. In fact would say three medium adults or maybe to medium addults and two small children tops.
If it were a 150hp or better still a 160hp, when then I might think about 4 adults as such
Cheers
Oh, I dunno Matt. I remember one time of a Tripacer with four adults and a kid in the baggage compartment. (Guess which one I was?

)
Bill
Grants Pass, Oregon