[MINI-Fit]

Well, I guess mine is a dud because no matter what car I use I get 9999 miles a lot and error is mucho big with usually a correction needed which when switching from car to car isn't fun to do so I gave up. I have never found any of my three cars to need zero correction. And I have talked to others that have used Scan gauge in my area that also needed correction.

Zero correction gives mpg far too optimistic by about 5+ mpg easily no matter what car I drive.

There are definitely times when I am on the throttle (lightly) and still get 9999 like it is stuck there until I blip the throttle sometimes more than once.

Still the usefulness of the Scan gauge for me is behavior training and awareness of gph as it relates to TPS. Less throttle usually means less fuel used. In the end I am able to get about 2 or 3 true mpg more than before using scan gauge II.

I wonder about AT vs manual transmission. You get 40+ and I get 25+ mpg.
How is scan gauge II affected by the transmission?