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My experience with the High Speed Rear Axle is in fact that my Pierce is using about 15% less gasoline. 320 miles test last summer as to the same trip in 2006.
A problem is when I am driving at a speed of 80 km/h (50 miles) the odometer is showing about 60 km/h (37.5 miles). Many of you must have had the same problem. Have anybody the solution?