Yes, I have read those; I suppose what I mean is, that "other factors" are beginning to dominate the commuting time, in this case, weight, wind resistance and such-like.

I am thinking along the lines that while the racer will be faster than the Plus, I suspect the difference is now likely obscured by those "other factors." For one thing, I will need to be more accurate with the time keeping - I have been rounding to the nearest minute since stopping for lights slows me down a bit and that is unpredictable. So the commute won't cut it for accuracy.