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VX
I believe that at the time the VX came to market,that the National 55 MPH speed limit was still in force.The VX would have been calibrated for this speed for the Federal Test Procedures at EPA Mobile Sources in order to optimize the EPA HWY rating.
By operating the car at 65 mph,your asking it to perform in an environment that it was not optimized for.
You may want to follow basjoo's lead with the aero.You'll get your lean-burn for sure!
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