Well, I did a little digging and couldn't find anything about the 1.0L's VVT. My guess is that the Aygo engine only uses VVT on the intake cam since its a lower priced model and it is more expensive to put it on both cams. Only real recent models (past couple of years max) have been using VVT on intake and exhaust cams.
As far as using it there really isn't much to it. Its all automatic and no real way to take advantage of it more so than just driving.
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