Hey Rowdy -
- Did you just buy the car used?
- Or have you had it from new and know the history?
- And is the car MT or CVT?
You are on the right path to come in here and ask. Fummins & Johnny Mullet are going to be your best resources on this.
Right off hand, I would think you have a sensor issue going on. And the bad sensor is throwing things off.
Let us know the bullet points above, give is some background.
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View my fuel log 2020 Mirage ES 1.2 manual: 42.4 mpg (US) ... 18.0 km/L ... 5.5 L/100 km ... 51.0 mpg (Imp)