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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