Some sites say 370cc some say 380cc, but you will still need to calibrate it as there will be a +/- factor. Ive been waiting until I do a long trip, fill tank, reset trip, drive, fill tank again and check fuel used against fuel pumped in, assuming the bowser is correct. The longer the trip/more fuel used the higher the accuracy will be, or even do over several long trips, noting fuel used/fuel pumped for each. i wouldnt measure it over many short trips as the probability of error will be increased. Do some quick maths and adjust the injectors accordingly. About as accurate as we can get outside laboratory conditions, temp/bowser calibration etc.