Just as reference for further readers.

Go to the file skins/asevo/style.css, around lines 26 to 50. There are three containers which width must be increased:

div.inner_wrapper
{
	font-family: Verdana, Arial, Helvetica, sans-serif;
	font-size: 84%;
	width: 88ex; /* Increase this */
	margin: 0 auto;
	padding: 1px;
}

/* Left column */
.evo_main_area {
	width: 62ex; /* Increase this */
	float: left;
	overflow: hidden;
}

/* Right column */
.evo_sidebar {
	width: 23ex; /* Increase this */
	float: right;
	overflow: hidden;
}

And you might also be interested in the Bootstrap version of Asevo: https://github.com/b2evolution/asevo_bootstrap_skin

If anyone is using bootstrap asevo, would they like to post a URL so that I can see it in practice?

Thanks

@loobyloo_2 this is a demo site, but you can get an idea here: http://mgsolipa.com/index.php/blog/