The theta projection method of creep analysis is known to produce the poorest predictions of creep properties at low strains. This paper applies a recently suggested modification of the theta concept to 1CrMoV rotor steel where long term data exists to enable an assessment of this modification to be made. The modification takes the form of two additional theta terms that allow the initial stages of any creep curve to be modelled more accurately. The paper shows that the resulting 6-theta approach produces predictions of long-term failure times and minimum creep rates that are as good as those obtained using the traditional 4-theta approach. Unlike the 4-theta approach, the 6-theta approach is also shown to be capable of accurately predicting times to very low strains (0.05% and 0.1%) at stress levels as low as 77 MPa (well below the lowest stress of 230 MPa used in the theta analysis). For times to 1.0% strain or more the 4-theta and 6-theta techniques give similar short and long-term predictions.