This was not very scientific, so take it with a grain of salt. But when checking the dB levels at each of the front doors - driver's side deadened (72-74 dB) and the passenger side as from the factory (77-78 dB) there seemed to be a 4-5 dB difference when on the freeway at 75 mph.
We checked one point consistently right above the cup holder.
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I'm a little surprised it was that much difference....like really surprised - it seems like a lot. It will be interesting when we finish deadening the passenger door and see if we get a similarly reduced reading.
The middle of the vehicle above the center console was around 70 dB.