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Normally,
The a/c is off as is the factory sound system.
I suspect it is a combination of a small factors.
The roads are flat and the cruise is on which recirculates some of the exhaust gas as well as holding the throttle steady.
There may be a lean burn factor cutting in under these conditions as well.
Interestingly enough the previous Commodore sedan (an 89 VN V6 , a five speed manual and also 3.8) managed a best of 10.0 despite a lower weight , manual gearbox , no a/c and the same size tyres (205 / 65 / 15).
Cheers , Pete.
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