A 'race simulation' in practice, when the teams are trying to get tyre data, aero data, engine data etc etc without breaking their car, or showing their hand too early, is not the place to draw conclusions about the system.
When Vettel is faced with passing Alonso with 5 laps remaining and a win at stake, then we shall see how good it is.
Also bear in mind that the Renault engine is underpowered, so Vettel passing Alonso will be much harder than a Mercedes engine passing Alonso. This isn't an issue, as otherwise the Red Bulls will pass everyone and win every race. We can't stop them winning from the front, but we can try to stop them winning from further back!!!
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