Capacity of windshield washer fluid system.

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2007 Mazda CX-9 Touring
Hello Everyone

I was trying to activate the rear washer fluid and none came out. I then tried the front and washer fluid came out of it like normal. This morning I added a little fluid to see if the back one would work and it did. I then decided to fill the reservoir with washer fluid. After going through one gallon of fluid it is still not full. What is the capacity of this system from empty to full. Does it really take that much to fill this system. All input would be greatly appreciated, thanks in advance. (confused)
 
You do not have any idea what the capacity is? I am going to see if I can finish filling it up tonight or on the weekend and I will see how much goes into this reservoir.
 
Wow over a gallon capacity on the washer fluid tank. Wish the capacity was half that for the transfer case which is a measly 17 ounces. Thanks to everyone for the input.
 
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