Is it possible to see basic stats in metric?
 

Basic Stats are empirical even though I selected the car to be in liters and kilometers. Is it possible to see basic stats in metric as well?

Yep, click the "Metric" link at the top-left of any page. That will switch the entire site view into metric units. There's a little more info in the FAQ.

Does this by any chance also change the RSS feed to the same units?

Naesstrom, yes if you switch views the links to RSS feeds across the site will change to the correct feeds for your view. If you're already subscribed to a particular feed, you'll need to switch views, click on the new feed link and resubscribe.