I am sorry to have to do this, but I have looked through the site and cannot find a direct answer to the question...
Anyone with a shark tune, can you tell me what happened to your fuel economy? It seems like it got better for most people. Yes, if you drive like a maniac (which you may be inclined to do at first) your fuel economy may go down. But what is the long-lasting effect on fuel economy?
And if you want to answer this question, feel free: Is it worth the money? If not, what would you rather have/do to your ZHP?