Tax Depreciation for Autos With Bonus

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I have 3 questions related to this topic.

  1. Our company's tax advisor says that for luxury automobiles that have 100% Bonus (e.g. $18,000 for a car purchased in '18), they should have no more tax depreciation on them till year 7.  The way Sage software does it, calculates depreciation each year after Bonus (starting with year 2).  Is Sage doing it correctly?
  2. If we want to choose to opt out of the new Safe Harbor for automobiles (included in Sage Fixed Assets 2019.1.2), how can we do that?  The software is automatically applying the Safe Harbor to our 2018 purchased vehicles going forward.
  3. The way Tax Depreciation was calculated prior to the Safe Harbor (when100% Bonus was in effect), it took 50% of the car's acquisition value and multiplied it by the IRS Publication 946 Rate Table rate.  Where does the 50% come from?  Why isn't it 100% since that is the Bonus Depreciation rate?