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Battery degradation

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This does not seem excessive to me. Maybe slightly but not much. This is ~7.7% degradation at 70k miles.

I have the same year model x but 75D. Ours has suffered about 6.3% degradation at 38k miles. So not too much more for double the miles as mine. Seems about right I am thinking.
 
We did math in a bit different way:
MX 2016 90d, 6 seater, 36k miles on the clock. We had a trip over weekend with 3 persons, fully loaded front trunk and Thule bike trailer with 3 bikes. 80% of the trip speed was around 60mph. The results: 122 miles = 38 kWh. Considering the fact that usable capacity of the battery is 81.8 kWh, we arrive at 262 miles it can be covered under these conditions.