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I've seen various figures quoted but can't say for certain. I have two data points, however:
1) In the G1 Insight, the CVT had an EPA (adjusted) highway fuel economy of 49, while the manual was 60. The manual has slightly taller gearing. Real-world, a manual peaks at ~100mpg @ 50mpg, while an auto will struggle to see above 70mpg at any speed.
2) My wife and brother both have 2007 Honda Fits. Hers is a manual (EPA 34 highway) while his is an auto (EPA 35 highway). The auto has a much taller top gear. Real world, he's averaging mid 30's mpg, while she's averaging low to mid 40's, despite shorter gearing.
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