DebunkedFailed for most people who tried it
Fill fuel early morning to get more litres
The density argument is real. The amount is not.
Do this insteadGo when there is no queue. The time saved is worth more than the millilitres.
Why it works
Fuel does expand with heat, but pump tanks are underground and barely change temperature through the day. The measured difference is a fraction of a percent.
Source · https://www.motorbiscuit.com/truth-behind-fuel-saving-myth-filling-gas-tank-morning-saves-money/
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