<h2>
<i style="color: rgb(102, 149, 45); vertical-align: inherit;" class="fa fa-gear"></i>
 Performance
</h2>

h2.Geared:before{
    display: inline-block;
    color: rgb(102, 149, 45);
    font-family: "FontAwesome";
    content: "f013"; /*The actual character FontAwesome uses */
}

<h2 class="Geared">This text will have the gear</h2>