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So a detail, I see the magic 55 thrown up time and again as more efficient,
Well my little 318ti bmw peaks its highway mileage at 68. Not 55.
I get a consistent 34 to 36 MPG at 68. I get about 32 at 55.
My jeep Wrangler gets the typical 15 from 45 to 64,
after that the mileage drops with speed. Of course its
as aero as a drag chute. So its my special purpose rig
and only gets driven when I need the terrain capabilities of it.
I rent a lot of vehicles and the Chevy Malibu is magical it gets 32 at 75 MPH.
The Saturn Aura with the 6 speed Auto does the same.
The base Cobalt I got a month or two ago was lucky to break 25... 3 spd auto and no cruise.... ick.
Its all about tuning, design, gearing, and aero.
Dave
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