According to Citroen's figures for the Xantia, the 1.9 is more economical than the 2.1. Even when the 1.9 got the catalyst and EGR it still maintained a gap between it and the 2.1, albeit a small gap. The thing that confuses things is that according to Citroen's figures, the XM is more econmical than the Xantia when both have the 2.1, although the 1.9 still beats both a 2.1 Xantia and 2.1 XM.Peter.N. wrote:I have not had experience of the HDI but I can say that the 2.1 is a much better and more efficient engine than the 1.9.
So, on paper, the 2.1 is beaten on economy, but it is a better engine in other ways, e.g. 110bhp instead of 90bhp etc