Porsche is tipped to take a radical decision and offer its first diesel engine.
Reports this week suggest that an Audi-sourced V6 will be fitted in the Cayenne, improving its fuel consumption to a marginally more respectable 23mpg. This engine will be available from March 2009.
Porsche boss Wendelin Wiedeking has indicated in the past that Porsche was prepared to consider a diesel, and upcoming European - and North American - legislation to bring down average fuel economy and carbon dioxide emissions across its range has made this a necessity.
It is, point out pundits, cheaper and quicker for Porsche to source a diesel from Volkswagen-Audi than to bring a hybrid to market. The Cayenne hybrid is still a long way off, however.
The engine is thought to be based on the current 3.0 V6 Audi offers, but enlarged to 3.2-litres and with power boosted to around 300bhp.