Given the $ that GM has spent on things like fuel cell research I don't think that it would be out of the question for them to give Torvec a Tahoe to perform testing in order to give them a first look at this amazing technology. My personal opinion is that Torvec has disclosed that they are using a Tahoe for testing in order to give the appearance that they are working with GM. In the same way they used a Dodge Ram earlier. There was an appearance that they were working with Dodge, But as JG put it "Dodge is Dumb" for passing on the technolgy.