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in the first two 15-minute sessions, cars may run any fuel load and drivers knocked out after those sessions may refuel ahead of the race. However, the top-ten drivers must begin the final 20-minute session with the fuel load on which they plan to start the race. They will be weighed before they leave the pits, and whatever fuel they use in the 20 minutes may be replaced at the end of the session.
If a driver is deemed to have stopped unnecessarily on the circuit or impeded another driver during the qualifying session, then his times will be cancelled.
Engines
For 2006, engines are reduced in size from the previous 3-litre V10s to 2.4-litre V8s. The aim is to reduce costs and improve safety. With similar engine speeds, the change is expected to cut peak power by around 200bhp, which in turn is likely to add around three to five seconds to lap times at most circuits. The FIA may allow some teams to use 2005-spec V10s if they do not have access to competitive V8. The FIA will enforce a rev limit on any V10s to ensure performance is comparable with that of a V8.
Tyres
After a season’s absence, tyre changes during races return to Formula One in 2006. The thinking behind this is that the reduced engine size will offset any performance gain. Drivers also have access to slightly more tyres than in 2005 - seven sets of dry-weather, four sets of wet-weather and three sets of extreme-weather. Drivers must make a final choice of dry-weather compound ahead of qualifying.
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