Despite all the complains, the GOM can be useful in some situations. Personally, I use it to adjust my driving style to make it my destination when the safety margin is less than a few bars of charge. For instance, if I try to go somewhere 30 miles away and my GOM says 40 miles when I leave, I drive at a speed that keeps the "margin" above 10 miles along the way. I know it's a bit backward to use it this way but for me it has really reduced the stress in tight situations and I've always made it within a few miles of the target margin I had set for myself.
But don't get me wrong: Tonny's range chart is still more useful as long as you take into accounts external factors such as wind, temperature and road condition (rain / traffic).
