Does the weight of fuel affect the vehicle’s performance?

Always fill the tank and reset the odometer when refuelling, so you can keep an eye on your fuel consumption and know your position if the fuel gauge fails between fill-ups.

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Racing cars go faster and faster as they lose weight by using up their fuel. So, would it make sense for ordinary motorists to only half-fill their tanks to reduce weight and thus improve performance?  ZN

In theory, yes. In practice, no.

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Note: The results are not exact but very close to the actual.