What temperature do you keep your thermostat at?

Right now in summer: 67 overnight while we sleep (helps that we have tiered power pricing where late night power is almost half the price of it during the day), 72 when we're up, and 80 between 2 and 6pm when we have the most expensive power hours. Luckily we're in an apartment that's like three years old, so it's surprisingly well insulated and hasn't gotten above 73 during those hot hours.