BP Ultimate means engine quicker warm-up?

[rob323]

Originally Posted by 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.

Logically, the type of fuel used should have no noticeable bearing on the time the car takes to warm up. I believe it is probably due more so to the warmer ambient temperatures that we are having at present helping the coolant warm up quicker.