they're brand new already hahah only 10k miles on themOK, now I've experienced something similar to this, and it took me ages to try and describe the sound but "thump thump thump thump" perfectly described what I was hearing, and the location. It turn out that I needed to replace my back tyres and yes it stopped straight away once the new tyres were on.Coming from the right side rear end tire area I think. It isn't all the time but noticed it this morning pretty bad on my way to work. It's like a knocking sound that gets worse on acceleration then can't really hear it at like 60 but you know it's definitely still there. I have a short vid I can post but you can't really hear it well in it from my cellphone. Anyone else have this or experience it before? It's like the 3rd time hearing it I though it was the wheel bearing or something?