!! Welcome To AstinaGT !!
Yeap what Rupe said.
Ive only fill mine with 98, a couple times I fill with 95 but every now and then I hear like a ping (pingging) sound its not bad but annoys me with 95 so the last year and a half it been 98 only from BP and no pingging sound at all.
Any plans for the car ? Mods ? Or just leave it standard ?