I'll fess up - we're somewhere around 6k gallons a month usage, or about 200 gallons per day. 5 people (2 adults, 3 boys - 5,3,<1)
It's kind of hard to tell though, since our bill is quarterly and they round to the nearest 1k gallons. Our highest usage period was about 20k gallons per quarter, or 6.7k gallons per month (225ish per day).
I suspect the age of our appliances and how frequently things are washed is the biggest culprit. Our landlord has no interest in replacing our 18 year old dishwasher, 15 year old top-loader agitator washing machine, or 15 year old water heater, or the 1.5* gal/flush toilets. None of these units are even remotely eco friendly.
*Tank fill is adjusted to be as low as will successfully flush solid waste.
Having young boys, food/dirt/spit up/blowout/potty accidents (on their and our clothes, thanks kids!) mean we're running probably 8 (full machine) loads of laundry a week. Dishwasher is run every day and a half or so. Baths (shared water) for the boys every 3 days, and my wife and I average about 8 minutes of showering a day combined (I take a fast shower daily, she showers every couple days).
Our yard is hardly watered, maybe once a week if that, but I do wash our cars at home every 2 weeks or so.