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The switching of tunes is an actual re-flash of the ECU/PCM using the nGauge device. It takes several button pokes and 5-6 minutes of time with the vehicle stopped with engine off and the ignition on. It isn't a problem, just clarifying the process.
Gear head tune works good for towing or whatever. And is non specific for fuel. Worth taking a look at. Darrin have you looked at replacing plugs?