Washer/dryers are another interesting subject. Our switch to high quality front load ones maybe 10 years ago was one of my favorite appliance upgrades ever. They use significantly less water, less energy, less detergent, and clothes are dryer after the spin cycle. The only downside is they are quite a bit more expensive than top load.
In the case of front load the spin is definitely rpm-specific, meaning the spin/dry cycle you choose spins faster if you want clothes dryer, I think you can choose extra spin on ours as well. Not that I'm calculating it, but my guess is the energy used for faster spin or extra spin is way less than the 10 minutes or more of extra drying time for wetter clothes.
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