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On some of the bus conversion forums, they make reference to the DDEC responding differently when the cruise is on. It is actually possible, and common, that the engine is programmed to have more HP and torque when on cruise to encourage the truckers to run on cruise (aka to drive the speed limit)

I swear my engine pulls hills on the cruise without shifting, that it will not pull without shifting when I am the cruise control.

Richard, I took note of that today going west on I80. Now doubt with cruise off and mode button on, performance feels stronger..