One stretch of my 2800 mile trip last month, at 200 miles I had used about 1/3 of a tank (roughly, don't remember exactly) and it said I could go another 200 miles? Also, very regularly I will be at a half tank and go 200 or 250 miles, all highway, and it will say I can go only 170 or something to that effect.
Around town, normally it says 100 or so miles after I have driven 200 miles, but that's mainly because the wife likes to put her foot into it whenever she drives and DOES NOT know how to drive for efficiency. I never get to drive it around for a full tank day to day, so I can;t really say for sure.