When the car is fully charged in normal mode it says I have 272 miles. When I switch to Eco mode it says 201 miles....
Basically, I have no idea how much range I ever have left. I was driving the other day and it showed 50-60 miles left. I put it in Eco mode and it dropped to 14 miles. I put it back in normal mode and it went to 40 miles. Then dropped.
By the time I got home, it said I had 10 miles left - no warning came on or anything.
272 miles is hypermiling. It's possible if you are good, but it's not that fun to drive for 5 hours for a range test, trust me.
No matter what the GoM has said, I know from experience what to expect. I get about 50 miles per 1/4 tank driven at 80 mph in hilly terrain with AC on using the Eco setting and ACC.
Sidebar - Coming back from Vegas at 85 mph Sunday, I knew my car would make it. But when I was 60 miles from home, the GoM said I would not so I slowed to 75mph. At 40 miles, it said I'd come up 20 miles short, but I know my car. I stuck with the 75 mph though, maybe the car knew something I didn't. Slowly the negative numbers rolled into positive numbers. When I pulled in the driveway, I had 13% SOC left. So I could have stayed at 85 like I thought.
Your Range Warning can be set at 10%/20%/30% but I don't know if you can turn it off. I leave it at 10% which will get me about 30 miles in a pinch. The last 10% is more than 10%.