The real bus trip alters my previous linear regression

The recent bus trip I took from home to work modifies my previous linear regression calculations of a "travel time equation". The "real" bus trip had modest walking and very little waiting

For travel distances expressed in great circle miles:
Auto:              1.41 minutes/mile + 12.09 minutes  = 

Samtrans bus: 4.20 minutes/mile + 24.51 minutes =

The 3-16-2010 journey has these calculated  and real travel times

Auto, calculated  = 35.3 min.   Real = 45 min
Bus,   calculated = 93.52  min.  Real = 80 min.

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