Question for those of you who are battery experts... Once battery degradation starts setting in, is it ok to leave range mode set to on? Let's say your battery degrades to the point where it only achieves 238 miles, or 90%. At that point is it okay to just leave it on range mode permanently? I imagine the answer is likely "no" but maybe I'll be surprised. After 9 months and 11,000 miles my range charge reaches 260 miles and stops (5.0 calculation). Just curious about the time I'll reach 240.