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I put one on my F-150 with an economy tune and one for towing. I did notice the difference, but decided not to put one on the RV because of warranty concerns. Probably a bit paranoid on my part. You can always revert to stock when taking it into the dealer. Takes less than ten minutes. My concern was if the motor would not run and I had to take it in, it would still have the tune in it and Ford could pull the not my fault excuse. Although, I believe some Ford dealers sell the 5 Star tunes and Ford isn't Thor either.
I loved dealing with 5 Star, you can pick the parameters for the tune like drive style, fuel used, trans shift points etc.
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This post is opinion based on experience. 
2015 Hurricane 27K
2013 Sea Ray 220SD
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