So I have a Z51 and have the Firestone Firehawk's on them. I got a flat on one tire about 6 months ago so just ended replacing that tire. Now the rest of the tires treads are getting low and its time to replace the other 3 tires. I was thinking of switching brands because it seems like there are better tires out there. Am I going to have to replace all 4, or can I keep that 1 newly replaced tire? Oh yeah this is bascially my daily driver and I am a pretty "spirited" driver, but I dont take it on the track or anything.