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Originally Posted by Cobbydaler
Confusion reigns...
This link says too cold! 
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You're warmer (pun intended

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Originally Posted by http://www.formula1.com/inside_f1/rules_and_regulations/technical_regulations/5267/fia.html
6.5.4 No fuel on board the car may be more than ten degrees centigrade below ambient temperature.
6.5.5 The use of any device on board the car to decrease the temperature of the fuel is forbidden.
6.6 Fuel sampling:
6.6.1 Competitors must ensure that a one litre sample of fuel may be taken from the car at any time during the Event.
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I'm guessing the colder the fuel it is, the more dense it is which enhances performance. The principles applies to air intakes anyway.