MX5 ND Screen Wash bottle size

[Sigmamark7]

My girlfriend has a 21 plate MX5 ND. She claims that she doesn’t use the screen wash much, but about every 2 weeks, I’m having to refill it, because it’s empty. All of my cars take at least a couple of litres of screen wash, but the MX5 seems to hold only about half of that.
Is the reservoir really that small, or is there something else wrong?

[1690cc]

My son has one and he has to fill it every other week at this time of year. Doesn't hold much.

[lord summerisle]

about a thimble.

It's tiny!

[littleredrooster]

My NC3.75 is the same. On a long European holiday, I often have to refill it several times.