I have a 2011 RX450h which I purchased new in March, 2011. I was averaging 26 mpg overall and often higher until I brought it in for complimentary 10K service. Then the mileage dropped by about 20% and I rarely get over 22mph ever. The engine is running loudly and shakes at times. I brought it back to the dealership. They kept it for several days, called Lexus, and concluded that it was "a bad tank of gas." They drained the tank and returned it to me. After another 5K miles, I still get the same poor mileage. I have read other similar accounts. Has anyone gotten any further in their dealings with Lexus?
