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Old 05-30-2021, 07:51 AM   #14 (permalink)
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Join Date: Dec 2011
Location: New Zealand
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ND Miata - '15 Mazda MX-5 Special Package
90 day: 39.89 mpg (US)

Work Vehicle - '17 Toyota RAV4
90 day: 33.96 mpg (US)
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The Fit's engine is pretty darn efficient. Its achilles heel is its "sporty" city-oriented gearing - that and its box shape.

If you're willing to get into transmission work, most of the internals are interchangeable with the Civic hybrid and Insight. A 5th gear swap (same ratio from Insight and HCH) is good for -6% RPM. The HCH final drive is -17%, and the Insight final drive is -25%.

The Insight or HCH gearbox bolt up to the Fit's engine. I believe the CR-Z's 6 speed also bolts up, for what it's worth. The axle location and size is *mostly* the same on all of them, but the transmission side mount is (I'm fairly certain) different on the Fit.
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