Kubica, however, similarly suffered a remarkable slump right at the end of the season, resulting in his loss of third place in the drivers' classification to Kimi Raikkonen.
Heidfeld, who has always had a tense relationship with the 23-year-old, said: "I hope that in 2009 I am still faster than Robert."
In more than 150 grands prix, Heidfeld has scored 11 podiums but no wins.
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