I have been extremely disappointed with the fuel consumption of this car, and complaining to Lexus, ever since I bought it in 2009. I had moved on from a RX400h which had an official EU figure of 34.1 mpg and in practice actually easily achieved slightly over 30 mpg. Lexus are claiming 44.8 mpg for the RX450h and I foolishly had expected to achieve a figure of at least 39 mpg. In practice, with extremely carefull driving, the best I could obtain was 34mpg. Lexus firstly tried to reset the electronics and then replaced the battery, but with no improvement. They then told me that I was alone in having this problem and it must be caused by my driving style! I felt I was alone in having this problem until I read the Honest John website. According to, at the last count ,over 360 other drivers, 34mpg is a good average for this car! Lexus are still strongly pushing their mileage figure in National advertising (The Times 6.2.13 - two full page adverts). I think they are miss-selling and have submitted a complaint to the Advertising Standards Authority. The problem is that the EU figures are misleading They take no account of the differences between these figures and those actually achieved in practice, in respect of individul models. If anyone else feels as strongly as i do, perhaps we could take the matter further.