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There are various apps that can do it for you using GPS in your phone, or with a Bluetooth connection to an OBD adapter you attach to the car (if you have one)
For the record, the 28i has plenty of power and I imagine with a JB4 it would become a beast. I've had a few people with me who drive the N54/N55 variants of other BMW models and they couldn't believe mine wasn't the same.
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