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Probably 10-15% of near WOT on roads that had lots of traffic behind me, but mostly low 40s. Ive not checked the pipe yet, but I cannot find a leak and no smoke appears either.Was it 250 miles of wide open throttle? How does the inner tip of the exhaust look, any oil there? If the motor is burning oil rather than leaking it then there may have been an issue with the engine break in, might need new piston rings and to have the cylinder wall rehoned. My CT125's motor will go through a little oil when it's run at wide open throttle for a long time, but not that much. I check the oil almost every time I refuel and have very rarely had to top it off, maybe once every thousand miles. Losing a little oil is typical of an air cooled motor, but not going through the dip stick in 250 miles.