The only time I deliberately let air outta my tires is on really hot days (like MadisonGrrl) when the bike is stored in the car - the heated air in the tires can expand so much it can burst the tube... yes, its happened to us...
The air naturally "seeps" out of the tube anyways between rides - and a general rule of thumb should be to check tire pressure / pump your tires up at least every 3 days...
I find your friends advice interesting and wouldn't hold to much time in your thoughts for it.



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