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You'll never notice the difference.
I had a nice conversation with the local oil expert and amsoil dealer I know. This guy maintains fleets for companies and has seen a lot, so I trust em. He explained it like this.
As viscosity goes down the losses from windage goes down. However, there is an increase in friction losses. At some point, the two start to balance each other out. But, with the increase in friction losses, you also get some additional wear.
In the end, he suggested just to always go with a synthetic. The cold performance just kills dyno oil, and it also allows longer oil change intervals. But, stay with a slightly higher viscosity to reduce wear.
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