Always coming back to this page when a designer stretches a font on me. The accepted solution works great, but I frequently run into issues with margins.
Would recommend using the transform on the height instead of the width if you're running into issues, was a life safer for me in my current project.
.font-stretch {
display: inline-block;
-webkit-transform: scale(1,.9);
-moz-transform: scale(1,.9);
-ms-transform: scale(1,.9);
-o-transform: scale(1,.9);
transform: scale(1,.9);
}