If your commute to work if mostly hwy why not trade it on a 1M with the turbo set up on the hwy its bound to get better mpg. Or, trade it on a new M5. Same deal. With the turbos on there it'll be more efficient. However, if you can swing a second car I would definitely do it. I'd try and pick up a used Jetta TDI. Then you have 4 doors for practicality, diesel for efficiency, and you get to keep your M3.
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