Vin1

Hi, I have a 2000 RX300 with 79,000 miles on it. I have it for a year and alway have filled it up with premium gas. My friend had owned an RX300 and now he has an RX330 and always puts Regular gas in it. He tells me that this is what is recommended for this car. Is this true? Will regular gas cause any kinds of problems or performance issues with the 2000 RX300? Thanks!