It’s not a secret anymore that Porsche will debut the all-new 911 (dubbed 991) this September, at the 2011 Frankfurt Motor Show, right? Meanwhile, we found out that Porsche is working on a hybrid version of the 991, according to unofficial sources. How we know this? Apparently, the test mules spotted in California were recently spied at a gas station. Of course, there is nothing weird about this, but according
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