Ducati have put their 'fuel saving' clutch to one side for the time being as they are now happy with the fuel consumption they are achieving for the amount of power they are producing.
Tests with the clutch date back to when Carlos Checa was in the team in 2005, but in recent times it has been test rider Vittoriano Gaureschi who has worked on - and sometimes crashed while using - the system, which lets the engine idle when the rider is hard on the brakes into a corner.
The clutch then re-engages once the right speed has been found for the bike to tip into the corner, driving the wheel again and so giving the rider stability.
Advances in fuel and reduction in friction losses through oil have assisted power output, but figures are a closely guarded secret. The team's relationship with Shell is treasured by Ducati, with real gains being found through oil alone in recent years.
A Shell spokesman said, "Two new fuel candidates have just been sent to Bologna for testing. If improvements are recorded over the present Shell V-Power fuel, track testing is envisaged. One new Shell Advance oil candidate is in the formulation study phase and may be ready for testing at Ducati in January."
Ducati riders Casey Stoner and Marco Melandri both said last week in Italy that they are working on more mid-range power as they feel that the existing top-end power, although increased a little, will be sufficient for the 2008 season.