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Old 03-13-2018, 08:17 AM   #12 (permalink)
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Location: Vermont
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Gaptooth - '00 Honda Insight
Team Honda
Gen-1 Insights
90 day: 52.22 mpg (US)

Such Fit - '07 Honda Fit Sport
90 day: 41.27 mpg (US)
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A belt-attached electric assist would do everything an electric supercharger would do, only more efficiently. This is the principle behind nearly every hybrid.

And, it only really works in conjunction with downsizing an engine and regearing. So, not something you can really bolt onto an existing engine.
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