Conversation Between wdb and Perrenoud Fit

Thankx for the insight

I credit the undertray with 1+ mpg improvement in fuel economy. Much more important to me is the large positive effect it had on stability in highway situations. My commute used to be primarily on freeways, and the Fit got buffeted around pretty badly by the large trucks and sidewinds. With the undertray installed that was dramatically reduced.

I read you installed an under tray what kind of +MPG have you seen?
Thankz Mike