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You are talking about the GOM - the guess-o-meter - it only tells you via the number of bars how much charge you have. The range is an estimate based on your driving habits, so if you leadfoot it around town for a few weeks, you may see it drop down into the 60s. Go out freeway driving and staying light on the pedal for the next few, it may go up to 110. Regardless, the amount of juice in your battery at any point is the same, reflected by the numbers of bars you have lit. The reason it jumps after a trip to the dealer is they will disconnect the battery, and all driving history or memory is lost, and so it jumps up to what the system considers the max - and yes, its all downhill from there -