As`far as your fuel mileage is concerned, all you can do is make sure everything in the engine is in good shape like the air filter, fuel system is clean, etc. Make sure the tires are inflated correctly, remove any excess weight and watch your driving habits.
On your head gasket concern, there is only one thing that will prevent that and that is, do not let the car overheat. That is what blows head gaskets and damages heads. You should have no problem if you never overheat the engine.
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Wednesday, August 18th, 2010 AT 6:43 AM