Wonder if the 'magic wipe' or whatever it's called doesn't use as much screenwash?
I have read that the magic wash system (also used on the Citroen Cactus) is designed to not use a great deal of screenwash.
Previous PSA group cars which I have had, fitted with xenon lights, have all had larger capacity screenwash tanks, to allow you to travel further without refilling.
I guess with the 3008, whether fitted with halogens or LED's, none are legally required to have headlamp washers, so they just have 'one size fits all'.
I've yet to use my screenwash, but I've seen the different arrangement on the wipers themselves, where the pipes and nozzles sit on the wipers themselves.