I've always heat cycled all my tires. But it's usually just a few laps during practice then a few hrs of sitting before qualifying. Some is better than none. Any race tire will grain if you go 100% when new for a long period of time. If its sticker Hoosiers then they are fastest when new but most only run a few laps to get a flyer then they park it. If you stay out for a whole session you will grain them (Toyo included) and you might as well throw them away.