Quote Originally Posted by Hurricane87 View Post
My MPG has gone from 22-24 to 19-21, and I can't remember the last time I saw a little puff of smoke from the rear. I think my DoD has turned itself off. Is this possible, and will it harm the engine?
That smoke will eventually carbon up the rings and score the cylinders causing low compression. I would either by a Range device or a tuner to delete it. My oil consumption went down to zero after I bought and installed a Diablo tuner. You can use the stock 87 octane tune to save money on gas and just delete the DOD. I would do it before the engine is damaged.