Lift and coast is a setup choice pretending to be a driver instruction

When a team calls for fuel saving over the radio, that decision was taken hours earlier by somebody with a spreadsheet.

The radio call sounds like an in-race adaptation. Save fuel, lift and coast into turn one and turn eight, target a delta. Fans read it as a response to circumstances. Usually it is a plan that started the moment the car was fuelled.

The logic is simple enough. Fuel is mass, mass is lap time, and a car that starts lighter is faster for the entire race. So teams underfuel deliberately, then recover the difference by having the driver lift early and coast into braking zones, which uses no fuel while losing a small amount of time in a place where the loss is cheapest.

That is a defensible trade and I have no objection to the arithmetic. My objection is to how it is framed. It gets presented as fuel management forced on the team by conditions. It is a setup decision, made in advance, with a known cost, and it should be discussed as one.

The costs are less visible than the benefit. Coasting means the car is not accelerating and not braking, which unloads the tyres and lets brake temperature drop, and brakes that drop out of their window bite differently on the next application. Do it for twenty laps and you have introduced an inconsistency the driver has to work around every lap. It also removes the driver's ability to respond to an opportunity, because the delta has to be maintained.

There is a competitive cost too. A car in fuel saving mode is a car that cannot defend properly, and a following driver can see the coast happening from the way the gap breathes. You have told your opponent where you are weak, every lap, in the same two places.

The strongest version of the argument against underfuelling is about variance. The saving is small and roughly known. The downside is that a safety car, or a wet patch, or a long first stint behind traffic can turn a manageable target into a serious one, and then you are racing the fuel rather than the other cars.

Teams accept this because the gain is certain and the risk is probabilistic, and human beings are consistently bad at that comparison.

If the driver has to lift on lap three, that is not management. That was a mistake made before the engine started.