First GM needs to build a 30MPG car, then they can worry about buying the URL!

jk. I'd buy
www.over75mpg.com, setup a forum and let people talk about how they've modified their hybrids to achieve this goal, and have it all sponsored by "Dealer X".
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Long tail SEO traffic, while potentially noisy, is extremely important for small, new, websites (micro sites). It's the only type of SE traffic you can go after in the beginning, unless you're lucky enough to have an authority site pointing to you. Plus the more narrow that query is, the better chance of getting some one in-market.
Additionally, SEO success breeds SEO success, so one day you're ranking well for "Used 2007 BMW 535xi, Boston, MA" and the next quarter you're now ranking for "2008 BMW 535xi, Boston, MA" and then in another quarter you're ranking for "BMW 535xi, Boston, MA" and then "BMW, Boston, MA" until you reach something like "Massachusetts BMW Dealers" and you've gone from a very long tail search, to "stealing" traffic away from your competitors in droves. The important thing is to have a clear-cut plan of what your ultimate goal is and prepare your campaign around it. Ideally you want to be ranking for specific vehicles, regardless of the manufacture year, that you can keep building on year after year.
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While I can use only the tools provided to me, I suspect that search engine traffic for region, specific cars pales in comparison to region, specific dealer queries. By now, I think most shoppers are going straight to autotrader, cars, ebay, craigslist... when they know what car they want and they'll have used non-region specific queries to figure out what that car is. And no micro site is going to be able to compete with the results for "2008 Honda Accord, Toyota Camry, Ford Explorer...". So, I think long tail is very important for the success of a micro site.
Is anyone doing conquest micro sites? Building micro sites to rank high for your competitor's name?
Chip-