I can't explain it but the cluster did say mpg. I had checked the range on a little less than 1/8 of a tank and it showed a range of 463 miles. I think it just shows the number not an "m". When recalibrated it showed 305, much more realistic. My understanding is that the display is in US English but the calibration has to be matched to the display. The nav was calibrated by location, an exact point that this dealer uses all the time. It was dead on. The movement on the screen does lag slightly behind. I only drove about 25 miles but at least the turns were called out before it was too late to make them. Oh and sorry it was a typo, I didn't mean that you had never seen a bad system. I'm sure of it. Let me ask this though.. Since this is a CD based system, wouldn't it logically lag slightly as it tries to update? If it is trying to make some distance conversion from metric but place it on a US standard map display, it seems possible to cause a problem. You're right that it needs more testing but its looking hopeful.