Not confirmed whether or not this is actually a recal, but it is a known behavior (for several months) of the HCH2. No need to panic, the actual consumption as reported by the console display is still correct (also allowing for the known ~1.4mpg discrepancy between computer and hand computation). If you find yourself on a long straight descent, and can get your iFCD to stay 'stuck' at 0mpg, you'll see that your trip mpg is still increasing as it should.

Someday I might even beat that wascally kenny!

No whammies... no whammies... no whammies...