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iirc deviation is determined by comparing the output from the crank position sensor (which measures off the flywheel) and the cam position sensor which is a hall effect sensor that measures off a wheel on the cam. given the cam wheel is relatively small, the cam position sensor is very sensitive to where it is positioned. as such you take your starting deviation number with a grain of salt and what you really monitor is the amount and rate of change in your deviation over time; the deviation reading was designed to monitor wear in the system.
i don't think either 0.6 or -2.4 is enough to indicate timing is off (i think 12 degrees is one tooth ...).
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