Can't help in regards to the head gasket patch kit. Don't know anyone who has tried it. Hope someone can chime in and give u advice on it. I would say don't go cheap on it and look into the product as much as u can. Someone has to have some diy out there or words of wisdom. Glad ur suspension troubles are over though. Mine still needs some TLC from a wrench or 2. In regard to mpg I'm looking to try something I read earlier. Another X guy reported adjusting the parking brake out gained nearly 1 mpg over the course of 5 tanks after the adjustment. Worth a shot it's a pretty simple job from the looks of it.
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