http://www.lexus.com/assets/models/h...ance_guide.pdf
Lexus suggests using premium fuel vs. regular. Does this in fact improve mileage? If you calculate the increased cost per gallon and it improves over 2 mpg it is worth it, but does it really improve mpg? Ironically, they suggest driving without roof racks which are std on their RX400h. Any thoughts?
If one doesn't have a long stretch of road how can you use cruise control? Thoughts?