How often do you replace your brake pads?

The only thing I agree with is whenever the pads are replaced is to turn the rotors before the new pads are put on,or if the rotors are to thin by spec to turn and new rotors are put on,they should also be turned before the new pads are installed (this is a proven fact)! Brake pad replacement will vary from vehicle to vehicle and driving habits,around town,highway,foot on brake and gas pedal at the same time,brake stopping distance,quality of parts,etc.I just don't see replacing pads every 20K because a service advisor says it's time? When you said service advisor,I'm assuming you maybe mean at the dealer or Firestone and they are not the only folks that do brake work.There are lots of trusted,independent,family owned repair shops out there that you can trust with your vehicle's maintenance repairs at a lot less cost,you just have to find one.I replaced my pads/turned rotors last year after "83,000" miles on the pads and I drive 90% in the city(stop and go driving). I would get a 2nd/3rd opinion from a trusted source! Good Luck with it....