I had a look at the Schema stuff - I actually use it on another site of mine ( http://thebigeat.com ) for listings of takeaways, but it has made no difference SEO-wise and it tends to make my markup look like shit. But nevermind A/B testing, I am doing A-Z testing here - throw everything and see what sticks.
I'm hesitant to go adding my site as a citation - it's a good idea but it just seems a bit black-hat for me. Hopefully it's something that might happen organically though.
Marching in and adding links to your site to WP is certainly a bad idea, as well as being plain ethically wrong. I was thinking more of turning up to the talk page for the car article and just offering them the content, but even that probably contravenes wiki-core directive #5749327.
I mentioned it because your site seems like a genuinely good source that WP would be happy to use, making it a win-win. Don't try and use wikipedia for pagerank boys and girls.
I've always had the impression that actually being linked from wikipedia isn't necessarily a good thing SEO wise. That is I think that a long time ago google decided to penalise sites being linked from major wiki's to stop them being spammed to death.
But I'm basing that only rumour and supposition so certainly don't take it as truth.
I'm hesitant to go adding my site as a citation - it's a good idea but it just seems a bit black-hat for me. Hopefully it's something that might happen organically though.