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I have had my SG2 for 2 months it is set for diesela my MPG does similar going up steep hills with trailer or boat and also when decelerating or down hill it likes the 9999.
I've already got the latest version.... about a month old now.....Normally it's just fine un til I go up a big hill towing.....the MPG keeps getting lower (as it should) until it goes below 3MPG, then it starts showing triple digit numbers like 365 or 434 MPG. Haven't seen it do it not towing....YET!
The decimal "might" be hard to see??
I think you are seeing .365 and .434 MPG.
I "think" I get this when accelarating up the interstate
on-ramp in the AM. I'm kind of busy and don't really
may much attention @ that moment.