I have no accessories except the alternator, and even though this may sound pretty foolish, wouldn't it be more efficient to drive the alternator from the timing belt? I'm guessing the more belts there are the more places there are for energy losses from friction. Not to mention the extra pulleys, mounts, and etc. The only problem I could see with this is the difference in belts. I wonder which is more efficient. I read somewhere that chain is even more efficient than belts in terms of friction loss, but then the extra rotational weight of moving an entire chain kills off the benefit.