Quote:
Originally Posted by Tom K.
But I disagree that the Steptronic is more efficient than the manual as they have identical mpg ratings for the 128i coupe (18/28) and the MT is significantly quicker from 0~60 - by more than a half second.
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Well, the Steptronic in the 128, 135 and 335 have completely different gear ratios. We don't know why BMW chose the gearing that it did. There may be factors other than gas mileage.
The fact that in one application, 335i, it results in better gas mileage than the manual shows that it can be more efficient, and that the inefficiencies of a torque converter can be overcome.
I'm just saying that the DCT has much to improve if it's not matching the manual yet, given that it doesn't even have a torque converter.
I agree that the question on gas mileage remains.