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tjts is right. Reducing speed reduces throughput of a highway.
Aero drag is proportional to Cd. Reducing Cd will reduce fuel burn at 70, 55, or 35 MPH by the same proportion.
But if a lower speed limit is enforced in the name of fuel economy, people will despise the idea of fuel economy.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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