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This has been discussed several times before. With most modern cars, the manual tranny has lower gearing than the automatics. This makes for a sportier feel and reduces the need for downshifting on the freeway (because people are dumb and would complain about the low power). So basically more efficient automatics and better gear ratios in them are the reason. However, most hypermilers should be able to easily exceed the automatic ratings using a manual.
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