Rumble update.

[My new truck]

Mine was doing the same thing, tried mid- grade gas, then went to premium. No change. Had to run an errand about a hour from home, drove it hard on interstate both ways. Seems to have solved the noise at low speeds, for now.

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[ET bagel]

I think it is just the mode I was driving in. Normal. While in that zone of 40 mph and 1,000 to 1,500 rpm then switching to sport mode there is no rumble. Starting out and leaving it in sport mode also no problem. It’s the computer looking to give better mileage in normal mode. But full time sport can be a little too aggressive at times.