Being RV owners we all have a few unusual ideas concerning our rigs from the perspective of someone who doesn't enjoy this passion but to intentional change the engine program to such an extend as to require the use of fuel that will increase the cost per mile by 20% might be considered something beyond our special madness. And that would be on top of paying a couple of hundred dollars for the tuner. Definitely not something that would make a coach more marketable as part of an owner self sale.