I've edited my post after a bit more investigation, this increases the number of correction points but it still remains a very coarse correction. The extremes of the temperature are probably more symptomatic of lack of need for fine control rather than you ever seeing –160 The thing to bear in mind with eec-iv’s is that the fuel and spark tables are load based (in this case load = volumetric efficiency) and because all the latter ones use mass air sensing the fuelling and spark are shifted automatically. e.g. high ACT’s mean a less dense air charge and therefore calculated load is less and different parts of the tables are used.