Quote:
Originally Posted by Miller88
Are you sure there's not something wrong with the Focus like bad wheel bearings?
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Quote:
Originally Posted by rta
I am fairly certain the noise is coming from the engine. If I pop it into neutral and coast it quiets right down. No exhaust leaks or other excessive noise at idle or at lower speeds... I think it's just winding it out
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If there was some problem that caused a loss of mileage, it would also cause increased engine / exhaust / intake noise.
If I attached a parachute to your car to cause it to go from getting 30mpg to 20mpg, you would also be using more throttle, or be loading the engine more to get that lower fuel economy, and hear more engine noise. Same would be true of any other load on your car. Replace that parachute with a low tire, bad alignment, wheel bearing, or dragging brakes... They may or may not cause any noise themselves, but each could cause additional engine load, in turn causing more noise