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throwing fuel down the exhaust creates back pressure which can be used to help change the characteristic of the motor. I heard Vettel's motor modulating like a supergt car at one corner on Friday, it was pretty interesting. Running lean on fuel typically creates a hotter motor because the combustion is a more pure stoichiometric reaction with little left over to absorb the heat byproduct.
Running turbos is a prime example of the dangers of running to lean, with all the wasted heat hanging around the motor/exhaust manifold. The manufacturers will end up needing to waste more fuel on keeping the motors cooler or spending a lot more on components that are properly prepared for extreme temperatures to ward of mechanical failure. Which will cost money anyways.
Make F1 more cost effective by allowing refueling, and not requiring teams to change their formula.