How Formula 1 race strategy will be different in 2010
Bernie Ecclestone's latest controversial comments about introducing shortcuts to Formula 1 to improve overtaking has focused attention on the latest rule changes to be introduced into the sport.
Ecclestone's idea, dismissed by former Ferrari driver Eddie Irvine on 5 Live on Thursday evening as "horrible", is the latest in a series of proposals by him rooted in his belief that the decision to ban refuelling in 2010 will have a detrimental effect on the racing.
But that will not necessarily be the case - grands prix will look different but strategy, and the use of it, will still play a crucial role.
With just two weeks before winter testing starts in Spain on 1 February, and teams hurriedly putting the finishing touches to their new cars, we take a look at the key factors that will shape the races this season.
FUEL CONSUMPTION
The first big headache for teams will be calculating the exact amount of fuel to put in the car.
Engineers will have had enough time in winter testing to figure out their fuel consumption rates under different weather/track conditions and engine settings, and can use a lot of their data from last year so this shouldn't be a problem.
Where the headache starts is trying to carry as little fuel as possible to complete the race.
Three-second pit stops are the target - some teams think they can do it quicker even than that
Dominic Harlow, chief engineer at Force India, says: "We'll be working hard on saving fuel during the race.
"Even 1% too much fuel could end up costing you a position so it will be critical to carry exactly the right amount. If you finish a race with 5kg excess fuel in the tank, it will have cost you 10 seconds during the race."
So with very tight safety margins and even the temptation to under-fuel their cars in order to be quicker, potentially the biggest embarrassment for the teams will be running out of petrol.
There will be moments when drivers need to conserve fuel to make sure they finish the race - they'll have to slow down as much as they dare, while trying to keep others behind.
Engine mixture settings will be critical: Drivers will be leaning out their fuel mix when they can, for instance stuck in traffic or behind a safety car. This will allow them to enrich it when needed for more speed.
In this regard, Michael Schumacher and Rubens Barrichello may be at an advantage, being the only two drivers in the field who drove in the last non-refuelling season, 1993.
More info at
BBC F1