I open mine quite a fair bit as well.
I like to use it returning home from work on a warm evening.
My car is parked at a bus stop and is always in the hot sun. Even though I close the sunblind and use a windscreen blind, the car is of course very hot by the time I arrive home.
So I use the fob remote to open all windows to expel the hot air... then open the sunroof and switch off the A/C and let the hot air flush out naturally and quickly.
The impact on the fuel consumption is dramatic.... on a hot day I'll average (albeit a short distance) 10.5l/100km using the A/C. When the A/C is switched off but sunroof open it's 7.8l/100km.
Something really nice to return home to.... nice balmy late afternoon / evening with the wind through the hair - and saving fuel to boot.
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