Based on the information I posted in post 36, the automatic has an 18% better overdrive ratio. Stock for stock driven the same non-hypermiled way (like using cruise control), I would think the 18% better final drive would outweigh the advantages of the manual.
Despite this fact, I would still choose the manual over the auto. The manual allows for better driving technique that the automatic doesn't, such as P&G. Besides the manual is more fun to shift.
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