At the end of the summer my 2012 gt ran a 1/4 mile in 12.78 seconds. I just did another run, but this time it ran a 1/4 mile in 13.42 seconds. Both times I drove the same way. The car was in sport mode. I even tried warming up my tires because it is cold outside. I don't really know why I had different times. The only thing I can think of is the difference in the weather. Can anybody let's know if I'm right or is there other possibilities?