2021 Sienna Limited AWD
I could be wrong, but I believe small deviations like that (from 550 to 510) are expected based on your most recent average MPG. If you're doing a bunch of highway miles, then fill up and change to mostly stop and go driving, the MPG could change which would change the average, which would change the miles to empty. The issue with the hill parking changes the gauge so drastically that it can go from 150 miles to 0.I purchased my 2021 Sienna about 2 weeks ago. When the dealership filled up the gas tank it said I had 648 miles till empty. I have filled up twice since then. The first time I filled up it said I had 550 miles till empty and then two days ago it said I have 510 miles till empty. Why does my miles to empty keep going down?