My 2010 Mazda 3s 5 door is making a grinding sound when it drives. It sounds almost like something is wedged up under the car, but there is nothing under there . It still feels fine when driving. The sound gets a little louder when I am letting clutch out, but the clutch and shifting still feels fine. It is weird and I am pissed because the nearest dealership is 50 miles away. It is still under warranty.

Does anyone know what that might be?

 

Do you have to be moving to make the noise?
in / out of gear when moving make a difference?

Have a look at the brakes and nearby rotating parts like the half shafts - could have a branch stuck in there.

 

That is exactly what it was. I drove my fiance's car to work the day after it started, and when I got home jacked up my car and found a tiny little pebble wedged into the brakes. It is free and clear and running quietly again.

Thanks for the advice.