Ian, I had a steammate, but rarely used it, Have since sold it. Yes still use a guy to leaflet, not only for me, he does upto 3 or so others and is self employed. Do stop and refil, usually at lunch time, go home, eat sandwiches while van fills up.
Cleaning co, just because the speedo reads upto 160 mph doesn't mean you drive at that speed, same thing with a t/m pressure guage, it is possible to turn it down. I clean at 400psi. The difference is the amount of water my system will deliver at that pressure, a lot more than a porty, and it WILL also recover it. Regarding the van, I run a Toyota Hiace, not the biggest by any means, and I get 30 MPG out of it, so economical as well. As i said my porty bought my t/m, but I would not wish to go back to using it.
seems top me that t/m users usually have started out using portys, so they know the pit falls, and the odd advantge a porty has, the vast majority of porty users have never even used a t/m let alone owned one.