Thank you for your advice.
Thank you for your advice. Called Lexus Corporate and they only offered a top engine clean so I took their offer. Had the car in the shop for 3 days and just got it back yesterday. It shuttered twice since I've gotten it back, smh. But my car was returned to me on E, it was almost empty when i dropped it off, so being scared my car was going to die on the road i went to the nearest gas station (76) and pumped their 91. Im going to take your suggestion and wait til I'm on E again and pump Shell Premium. I've always pumped Shell but the 89 octane instead of the 91 (lesson learned I guess). I guess I'll also pump Chevron every now and then. Which gas is better though? Shell or Chevron?