2014 vs 2015 Corolla LE

#1
HI - I have a 2014 LE Plus with 15000+ miles and just bought a 2015 LE for my son. Both have 16" wheels. Although I've always been satisfied with the 2014, the new 2015 seems to be a bit peppier and feels more solid in terms of driving experience. Just new vs. not so new, or could there have been some performance tweaks in the newer 2015 cars?
 
#3
Just had the tires balanced on the 2014. There wasn't obvious vibration before, but the rebalancing made the ride better over bumps and feels a bit more solid. I think that was the main issue.
 
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