miles-to-empty. Been driving the MS for just 5 days and have 507 miles on the odometer. About 4 miles before we got home today, the charge remaining on the left dash showed 0 miles. The navigate maps screen showed -2% at destination and charging required (in red). i was sweating bullets and drove at 40 to 50 mph (yep) for those 4 miles (keeping up with traffic) and managed to make it home safely. So today on a full charge, we got 186 miles (cold weather, traffic and all kinds of variants from the ideal range). This is the base model that is rated at 200 mi EPA, so that is reasonable. Charge at the beginning of day showed 257 miles which is grossly misleading (in the Leaf world we used to call it guess-o-meter (GOM). So there apparently is a small margin of safety. Anybody know how much? On a related note, are Superchargers really 150 mi apart? Can a 60 kWH car realistically make it between SCs? The upgrade to 75 is beckoning on my "My Tesla" page, but at $9 K, i am going to wait a bit. The upgrade also means i cannot charge to 100% on a whim and the SC tapers off.