BP Ultimate means engine quicker warm-up?

[lh59]

I filled up my 1.3 auto Yaris yesterday with BP Ultimate. This is the first time I'm using premium fuel since petrol price has gone down a bit and I just want to try it for fun. This morning, I noticed that my cool engine light went off about 30% quicker than it normally took when I use regular unleaded. Not sure whether this is due to the premium fuel. Have anyone experienced this as well? I didn't notice any difference in the power though. Might be because I rarely rev my engine beyond 2500rpm. Will keep a close look at the cool engine light tomorrow again to double check.