Well that pressure sticker on your car is for standard tyres, these snow tyres aren't standard so I would stick to the recommended pressures for those snow tyres.
You are saying "Can I increase the pressure to get better mileage?"
Do you mean better mileage for the tyres of better fuel con?
As regards increasing the pressure to increase fuel con that will be negligable. Over inflated tyres will wear the centre of the tyre away more. Obviously this will depend on how long you drive with the extra pressure.
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