Was your friends speedo calibrated or was it the normal 7% over reading R1NGA? If it was uncalibrated you can knock about 20 miles off the range, about 275 real miles, as against 295 M3W optimistic miles. I would be seriously looking for a refill at 250 (real) miles (my speedo is calibrated). It may come in handy if you are planning a long trip with minimal refuel stops.
