Should not be any good or bad to using it in good weather. Is inactive unless you are in a traction loss condition where you might want it to operate. Should not hurt performance or mileage in any way unless you are a very aggressive drive and want to get a little wheel slip sometimes which it should not allow.
i know that it is no fun when you are expecting a little sliding taking a turn sharply and when the TCS is on, nothing really happens. I enjoy the sliding haha, just that little adrenaline rush i guess. the tcs will not harm your car whether it is good conditions or bad. i'm not sure if the TCS will slow down your car or not, I just leave it on unless i know i am gonna want to whip around corners that i wanna powerslide on. heh heh
i was trying to make it up a driveway hill that was covered in snow.... (i had the traction control on)... and just when i was about to get to the top, my car would stop and the Traction COntrol light would light up and blink. No matter how far i would press the accelerator in, the car would not want to go (rpms stayed very low). when i took the traction control off, i was able to gun it up the driveway safely enough. why did the traction control stop my tires from moving, they never spun in the first place when it was on?
it's the series of three buttons on the lower part of the dash closest to the driver's door , but your base model might not have it
2005 Mazda 6 GT v6 Sedan Triple Black as of Oct. 28 '05
1996 Ford Mustang SVT Cobra # 867 , 288 RWHP 280 RWTQ
Imported and Driven by ME from Atlanta Georgia in June '02