I think I know the difference but I would like to double check the difference in meaing between these two.<br/><br/>1. This device is <b>used</b> for controlling the fuel comsumption. (Describing what the device is used for?)<br/><br/>2. This device is <b>for</b> controlling the fuel comsumption. (What the device is for?)<br/><br/>Thanks.