I think the only way to test this would be to put the car on a dyno and establish a certain number of shifts and time of the shifts. There will be no way to test this in daily driving. There probably is a difference between on/off but it's so small it is probably difficult or impossible to measure. I do turn off SRM when the "E" light is on just in case.
With SRM on the engine will initially try to rev-match (not drop the RPM below 2000 maybe) if you are cruising at highway speed and then pop it into neutral to slow down for a stoplight if you aren't gearing down or pressing in the clutch.
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2011 Nissan 370z Black Cherry Sport Pkg - Daily Driver, , 1960 Morgan +4 fun car, 1986 BMW 325ES, 1998 M3 and 1996 Spec Miata - Race Cars
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