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The other day, in response to my regular update on Autoblog about what AutoblogGreen has been up to, a reader wrote and asked if there were any websites out there that discuss "tuning" or "tweaking" older (80's) Mercedes diesel cars to get better mileage? I thought this might be a good thing for AutoblogGreen readers to know about, so I set out to find some. Of course, since this is a green car site, and we've just had a nice feature on how to getting better mileage overall, I limited my focus t