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I see -- like in flight
I think I see where you're going -- sorry I didn't elaborate on it I was too busy ranting about the physics of high speed driving. For fuel consumption, airline pilots calculate flight plans and ranges using head/tail winds and fuel consumption at particular throttle positions. So a busy highway would have a significant "tail wind" with the perpetual motion of constant traffic, and could theoretically push you along given the right conditions. Also like fluid dyanamics -- stirring a cup of coffee, and the stir-stick follows the "current" around the cup for a while after you stop stirring.
This is complicated stuff -- but intruiging. Measuring the wind speed in the lane of movement would require a non-intrusive device like Nexrad radar (it measures the inbound and outbound speed of air). My gut feeling is that vehicles create vortices after they pass, and disrupt the airflow. More research is needed...
RH77
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MetroMPG 
Hybrid Mode
