[mbou13877]

I have a 2017 Volt LT and I'm in Canada. I've noticed recently that the OnStar app is showing the wrong fuel efficiency readings:

Car shows 2.2L/100km
MyVolt.com shows 2L/100km with 5525km out of 7721km being electric
OnStar app shows 8L/100km with 6656km out of 9132km being electric

I understand the MyVolt website would be slightly different than the car but why is the App so far off? This just started a few weeks ago. Anyone have any ideas why this would be?

 

[Murrcar]

I noticed it also in the US. The app counts all ERDTT miles as electric miles so all that gasoline you use in ERDTT is counted against the miles when the engine is running in the other modes.