I find my RX's computer to be extremely accurate when checked against actual fuel consumption. However, that does not include the "Average Mileage" figure, which is way off, but only the "Mileage Since Fill Up" figure. It also assumes the odometer reading is accurate. Local, around town mileage, has too many variables to bother to compare. Those would include speed limits, hills, stop signs, traffic lights and how much time sitting or idling among many.....not to mention drivers heavy on both the gas.....and the brake. When comparing highway driving numbers, ethanol content and tire pressure can have a noticeable effect, but IMO only about 10% or so.
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Absolute best mileage in the summer (i.e. when the air is less dense) all highway is almost 27mpg with nothing on the roof and only me in the car - at a consistent 65 mph. With my bike rack up there (no bike) it is about 25 mpg. I find that speed is a big determinant of the mileage. At 75 my 27 goes to 24.5.
Just finished a 1000 mile trip on mostly highway. Got 24 mpg. Around town mixed miles is about 19. I averaged 71 mph on trip...probably get better milage at slower speeds...but why bother ...you spent $50,000 on the vehicle milage shouldn't be a concern. My RX has a total of 2400 miles so it's still in the breakin stage. Love the drive......
When we purchased our CPO 2010 RX350 I was somewhat concerned about mileage from reading through this thread. I have been pleasantly surprised with its mileage. Around town and the work circuit we are averaging 21.5 to 22.0 mpg. On out last big trip of 472 miles we averaged 24.7 mpg. We had a good mix of interstate, two lane roads and some city. We have been more than pleased with its mpg performance. The RX350 has plenty of power when I need it as well. Overall with the quiet ride, fuel economy and performance we are glad we have an RX.