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We began to suspect there might be more to the Insight's rather touchy behavior than just the tires and decided to check the toe settings. The theory, set forth by Squire Csere, was that with mpg as a be-all, end-all priority, Honda probably selected toe specs to augment same. And so it proved to be. Insights are delivered with zero toe at the front, minimizing rolling resistance but exaggerating the car's response to pavement irregularities and the other variables listed above. We experimented with a little front toe-in—just an eighth of an inch—and found that it had a profound effect on fuel economy, which deflated from 68.6 mpg to 63.2 at a steady-state 60 mph
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2000 Honda Insight - Long-Term Road Test - Auto Reviews - Car and Driver
Almost a 7.5% drop in setting from zero toe to 1/8" toe in just the front. Inversely it would provide a gain of 8.5%. Huge!
I can't say how thorough their testing was to get those numbers, but it shows promise.