I drive a lexus gs 300,its a 2003.What type of gas is good supreme or super?

What does ur owner is manual recommend? l will bet it recommends 93 octane (which l think is what u mean by super). If that is what it says that is what I'd give it. Any lesser grade will cause the engine to knock & it wo not burn as clean - u will actually not get as good of mileage. l have an Acura that calls for 93 & occasionally l will put some 89 (mid grade) in there with the 93, so l will average about 91. But the savings r negligible.

Like my daddy said when l bought the luxury car. if u can afford the car u can afford the high grade gas u have to put in it.

since its a top of the line car it needs top of the line gas. and remember DONT MIX GASSES TOGETHER NOT GOOOD

I've heard that using 93 octane is ur best bet so the engine will run the smoothest it can, not to mention it will give it a little more power, Mobil gas is the best to get (they say its better quality & will give u more miles to the gallon). Always fill up at night or early morning u will get more because the liquid is more dense at cooler temperature (More gas for ur money). Gas is also more expensive closer to weekends so fill up in the middle of week preferably Tuesday or Wednesdays.

It takes 91 octane

l have acura tl 05 it says 93 but l put regular since l bought l have no problem with u should try mid and if it works then go with regular if you have problem then got back to supreme u know