I own a 2013 RX 450h and from the day I purchased it I have averaged 24mpg, bouncing from 23-25mpg highway mileage, with anywhere from 22-26mpg city... a far cry from the 28/32mpg advertised. The dealership has reset my ECM three times, changed the inflation on the tires four times, and added a special spoiler and "areo fins", all with 0 effect. After pestering Lexus for over a year, I was told that 24mpg is NORMAL for this car, and there is nothing wrong with it. I have polled other 450h drivers and the vast majority state their mileage is the same, around 24-25mpg. Only 3 have said they get the promised 28/32mpg.
I intend to file a class action lawsuit against Lexus for artificially inflating their MPG rating on their hybrid vehicles in order to increase sales and justify the massive price difference between the hybrid and regular models.
I am polling all 450h owners, 2010-2015, to find out what their average mileage is. If a significant number are having the same issue, I will begin the process of filing on behalf of all 450h owners.
Again, this is only for 2010-2015 models. Thank you in advance for posting your MPG experiences.
Ben