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The HV battery is covered under the powertrain warranty (8y or 150k miles). Is it over 150k miles? Just subtract the cost of a battery replacement. Last I saw it was somewhere between 10k and 20k, depending on battery spec. Deduct that from the normal M3 value.
I believe that Model 3 HV battery was warranted for 100,000 or 120,000 miles, depending upon the model (Standard Mid-range, RWD, Performance). Don't think it was ever 150,000 miles.