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Old 09-10-2019, 06:26 AM   #2 (permalink)
Master EcoModder
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Join Date: Dec 2011
Location: Vermont
Posts: 3,766

Gaptooth (retired) - '00 Honda Insight
Team Honda
Gen-1 Insights
90 day: 54.26 mpg (US)

Such Fit - '07 Honda Fit Sport
90 day: 41.27 mpg (US)

Connect - '15 Ford Transit Connect XL
90 day: 20.08 mpg (US)

K-sight - '00 Honda K-sight
90 day: 38.29 mpg (US)
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I can't speak for towing, but in most vehicles, going with taller gearing improves economy all the way up to the point that you can't maintain speed in that gear anymore - and then you just downshift.

In my car I picked the tallest 6th available from any model (usually paired with shorter final drives) and had a custom final drive cut which was 30% taller than anything OEM. I also upsized my tires slightly. Going even taller would help even more, but my low gears might need to be changed so they're a little closer together to keep it fun when I want to waste fuel.
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