Different tone in engine between 70-75mph

Rich.

A2OC Donor
Hi

When i'm driving i've noticed a different tone in the engine between 70-75mph. It is sort of like a buzzing/humming sound. Once you are above this speed or below it sounds normal. Is this normal?
 
It'll be related to something vibrating due to air and the speed, not mechanical.

Relax and enjoy the car, you've got a decent one for the money you know.

Cheers,

Mike
 
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