I have recently bought a 2007 Lexus IS250 and find that the speedometer display is inaccurate, i.e. it shows the speed at 100 km/ h when the actual speed is only 93 km/h. The dealer says that this is within the accepted range and they are under no obligation to fix it. Do you know if this is the case? My other issue is the outside side mirrors, which give the perception that a car is a much greater distance from you than is actually the case and can be very disconcerting not to mention unsafe when changing lanes. Is there a reason why these mirrors are used nowadays?
Both of your complaints are common and they're not only related to Lexus. The dealer is correct, the speedo is within the limits allowed under the law, so he isn't under any obligation to correct it. The mirrors are used to give you the widest possible view of what's around you, and they work well in doing that, but they also distort the distance to the cars following you and you have to be careful when changing lanes. You can have the mirrors replaced by flat ones at your local glass shop.