[GrannyGrump]

@JSWolf: Of course, you could also assume that users who read with the default sans-serif are accustomed to it, and know what to expect and how to interpret its appearance.

Wouldn't embedding a main body-text font make it difficult for users who want sans-serif? Or who just don't like the font you choose to inflict on them?

PS: @Jellby, when I check with align-left, the sans-serif is still more tightly kerned than the serif font. Maybe it is just a feature of that font...