Most of you are reporting usage somewhere in the 20 - 40 gal/person/day range, which seems pretty impressive to a newbie tightwad such as myself.
My 2.5 person family (son is away at college most of the fall/winter) is using somewhere in the 60-70 gal/person/day range, which is better than the USGS numbers, but still way too extravagant for my tastes. Our toilets are old, but we practice selective flushing such that each person is flushing probably 4 times a day (3.5 gal/flush X 4 = 14 gal/day/person). That right there is nearly half your typical usage. We drink mostly tap water and coffee brewed with tap water, so that probably adds about a half gallon per person, maybe more in hot weather. My son and I typically shower daily, but my wife has a fairly dry complexion and can get away with showering every 2-3 days.
I think our biggest problem is laundry. My wife can't stand to see the laundry basket full, even if we still have plenty of clean clothes in the drawers and closets. This results in the washer running many partial loads. It has a water level control, but I still think it would be much more efficient to run only full loads. Towels and sheets have to be laundered separately from other clothes because they get a different type and/or amount of fabric softener. Once a week or so, the towels get pulled off the racks, washed, and then the same towels go back on the racks. Even though we have a closet full of other towels. When our son isn't home, this results in running the washer (and dryer) for two bath towels, two wash cloths, two hand towels, a dish towel, and a dish rag. Which really drives me up the wall, but my wife has been very resistant to any constructive criticism. She's been the chief launderer for 25 years, and I've been glad to let her do it, so she gets very defensive when I make the slightest suggestion that maybe we could economize on our laundry.
I'm also wondering how much dish washing uses. We don't have a dishwasher, so everything gets washed by hand. We don't really have the kitchen space (or tolerance for dirty dishes) to let a day's worth of dishes pile up and then wash them all at once. So, we end up washing small amounts of dishes multiple times a day. We do practice common sense conservation, such as not filling the entire sink and not leaving the water running the whole time we are washing.
So, I'm interested in hearing your conservation measures. What are you doing to keep your usage well below the national average?