We got a Bosch dishwasher yesterday...model SHE66C.
I filled up the rinse agent dispenser before running it.

On the second load, the "low rinse agent" indicator was already on.
After it finished, it took another 2 ounces of rinse agent.

At the rate of 1 ounce per load of dishes, rinse agent would bankrupt
me.

Any idea what's going on?

The dispenser arrow is set to the factory default of 3.