I was complaining last month about the way Blogger sorts feeds (by last update, instead of published date). Phydeaux3 found the solution: you just have to add a parameter to the feed address. Instead of:
To actually change the address of your blog's feed, you'll have to edit the template or to modify the address of the original feed, if you use FeedBurner.
In the old version of Blogger, the feed was sorted by published date, but the new Blogger changed that. The new approach is good for important updates (you made a big mistake in a post published last month) and bad if you change the wording of an old post or fix a broken link.
So it's up to you to decide if you want to have all the updated posts in your feed or just the recently published posts. I chose the latter option.