Learn the correct way to check your car tires (tyres for those of you in the UK) and do it at least monthly. Over the life of the tires, your fuel savings will probably exceed the cost of the tires. It will also keep you safer on the road. But do learn how to do it right. Checking them after you've been driving, for instance, will give you a false reading. For that reason you might also want a hand pump so you can bring them up to the right pressure at home, before you set out.
Remember that all appliances produce heat. (All forms of energy eventually degenerate to heat energy.) A 60 watt light bulb adds as much heat per hour to your house as a 60 watt heater. Even a refrigerator produces heat equal to the wattage it draws from the mains. Appliances don't necessarily put the heat where you want it , so the contribution to home heating isn't necessarily as efficient as your heating system, but they do put the heat into your home. So "energy savings" claims may be exaggerated if you are consuming energy to heat your house most of the year anyway.
On the reverse side, if you use air conditioning, then the energy cost of your appliance use is more than doubled. Because air conditioning can't be 100 % efficient, your a/c will consume slightly more than an extra 60 watt hours to remove the extra heat produced by having a 60 watt bulb on for an hour. Double the cost of leaving the fridge door ajar, leaving the computer on, etc.
We like to air dry some of our clothes in the basement. In winter, we don't want high humidity to cause mould and mildew in colder parts of the basement, so we run a small dehumidifier in the laundry area. This does not not carry an appreciable energy cost, if any at all, because the energy consumed by the dehumidifier simply takes that much load off the baseboard heater. What it does do, is allow us to reduce the use of the electric clothes drier, and keep the energy in the house.
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