I drive a mix of suburban roads with timed lights, divided multi-lane highway, and urban insanity.
The urban and suburban roads are what kill my mileage most days. I can hit 45-49 MPG average for the trip on the highway, but once I get off of there it drops to 38-43. Lights are incredibly poorly timed, roads are filled beyond capacity, and the drivers are just completely insane. A mild hybrid system that used an electric motor to get me from a stop to 15/20 mph would save a good deal of mileage for me.
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