I've got one in my Van, I've got a 400l tanl, I usually on a busy day use about 300 or so, 100PSI after prefilters, fills it up quite quick.
Means that after work you have to plug it in, and have it connected, and you can't just quickly fill it up from the IBC if you need some more on bigger work. But works very well for me I must say. Never timed it, but it's always full next morning. 238tds in, 20 out.