A couple of days ago my windshield washer spray pattern changed. Instead of flooding the the windshield, it dribbled out in lines of fluid. Then it stopped working altogether. I figured it was out of fluid. It seemed pretty early to be out of fluid, since I've only had the car two months and haven't used the washer much. So I filled up the reservoir, which didn't take that much fluid (1/2 gal?). That got the washer working normally again. However I realized I never got a "low fluid" warning light. Perhaps I just missed it--I don't think so but whatever. I am used to cars today having reservoirs of a gallon or more. Thoughts?