Fuel economy is definitely a benefit, but the driving force is top speed and reducing the rpm load on the engine.
I tend to be a little heavy footed and literally pin it when the prevailing speed limit allows.
If I can drop the rpm and pick up the ability to run at the 75 MPH speed limit loaded without stressing the engine, I will be happy.
I currently get 6-8 mpg...and have zero aerodynamic advantage. However, I did remove the rooftop wing since down force is not an issue.
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