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Thanks Nick. This was my thinking too (website first), but was pushed to publish everywhere at once: LinkedIn, YouTube, website, Facebook. Backlinks from multiple c-blocks and off-page SEO are my concentrated efforts.

Another thing to consider is how having your brand in all caps takes up more of the allotted pixel space for the title, even if it's just a little bit more. I'm seeing a lot of titles (in Google SERPs) have their brand name moved to the front, regardless of the actual title tag, so  think about how "MOGAS: Title Tag" vs. "Mogas: Title Tag" might push important terms out. You might even consider having your titles start with the brand name since Google's adjustments seem to indicate a preference. I hope this helps!

Yes, link building will be extra (and often duplicate) effort. Adwords would be another concern. Other maintenance issues not so much. My goal was to target a specific visitor segment with a bonus of having the top keyword in the domain name, but recognise there are more benefits to keeping as one site. Thanks for your and Devanur's responses.