Edit: OK, I am not sure where I got 2.5 gallons from because it turns out standard toilets in the US are 1.6 gallons, as the comment below states. It still seems crazy to me that 1.6 gallons can push waste all the way from the toilet to the sewer. I feel like it would stop at some point and need more water to get to the street.
On a side note, I find plumbing and water treatment fascinating.
In: Engineering
You’ve also got gravity, other water from all sources working together to flush the waste into the sewer pipes. There isn’t a separate connection for toilets and for sinks, showers, bathtubs, etc.
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