[Texas Red]

My experience is similar to yours but perhaps not quite as severe.
1. When I fill it up it shows full but not over.
2. I have driven until the warning bell and low fuel light came on which was very close to the empty mark if not right at it.
3. Computer said I had about 40 miles range remaining at that point.
4. It only took 26 gallons to fill it up again.

I've gone past the fuel warning until I thought I was running on fumes and it only took 27 gallons.

I figure they intended a 5 gallon hidden reserve (but that's just a guess). In an off road environmnent at 7-8 mpg, that would still give you about 35 miles before you actually ran dry.

Jim
Red H2 in Texas