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Well, you happen to drive a lot more than the average. An average driver would put 20k in a year right?
So if you consider the price of a M3 compare to a sedan, let's say a corolla which will be around 25k...it will take around 9 years to compensate for the price of the M3.
Of course the M3 is more fun to drive, but money wise...
And yes, less maintenance but what about your battery after 9 years? Mine is showing 15% degradation after 3 years and I don't drive a lot.
If I have to change it after 8 years, I will lose the maintenance benefit.
So again, I like my car but this purchase was not a rational purchase.