I filled up a day ago, and initially the range went to 596 miles, then 609, then down to 546. Having done some 60 miles since then the range is now showing about 420. On a separate occasion I did an 80 mile round trip, and when I got home my range had increased by 40 miles. Some fuel monitor! Does anyone else notice that the range is very erratic and recently so misleading I nearly ran out of fuel.