I'm not sure if this would apply to your car but one of the signs that something was wrong with my car aircon was as occasional bad smell (really offensive) when the aircon was running. When the unit failed it turned out to be the evaporator (installed behind the dashboard) that was the problem and the bad smell was apparently diagnostic of that.
Since your car is new that's unlikely to be the problem but if you have had the system of "recirculate" it will take in any smell from the interior of the car including vapours from anything that was used to clean it prior to delivery. Anyone who has ever smelled the air from the car aircon used by a smoker will know how well these things take in smells. Si it could be simply that ... vapour from cleaning materials. It will take a little while to dissipate but it will eventually go.
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... it's nicer and it'll save on fuel.
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it's not nicer at all, it's hot, sweaty and sticky and the drag on the car caused by having the windows open will send your fuel costs soaring. A car with the windows closed is more aerodynamically efficient, one with the windows open is not.