I voted "manual" because it opens up a wider range of driving techniques that will help save fuel. That's even before you consider any extra driveline loss from the transmission.
Speaking of which: The CVTs that I remember from when they just started showing up in mass-produced cars all had significant friction losses through the transmission. They were noticeably greater than those through a manual transmission, though I do not recall any numbers. Are they still like that, or have they figured out how to reduce the friction?
-soD
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