Which of the following statements is not true about proper tire care? a. if you see a wear bar across the width of the tread while facing it, it's time to replace the tire. b. properly-inflated tires are critical to vehicle control and good gas mileage. c. tire tread depth can only be checked by a properly-trained tire expert. d. under-inflated tires experience uneven friction and heat buildup, which can lead to blowouts.