It takes less than a minute to whine at my husband to fix my car when it breaks, instead of taking it to the shop. It takes him longer than a minute to fix it, of course, but that's his problem!
Seriously? Plan my errands so I use the least amount of gas (and make said errands take less time). Clip a coupon or two. Check junk mail for coupons/offers before tossing it. Double check bills/reciepts for errors. Adjust a thermostat. Turn off a light switch. Change a light bulb to the new florecent kind. Turn off water while brushing teeth/lathering hands. Start a pot of coffee to take to work.