Did you know the fuel you buy during the day is not the same fuel you get at night — even though the pump shows the same litres?
This isn’t a myth. It’s pure physics, and it affects the REAL value you get for your money.
Temperature Changes Everything
Fuel behaves just like any other liquid:
Heat = expansion
Cold = contraction
watch video on why you should always buy your fuel at night
This means the density of the fuel changes throughout the day – and that density determines how much energy you’re truly buying.
Daytime Fuel (Less Dense, More Expanded)
During the day, temperatures rise.
Even though underground tanks are insulated, fuel still warms up, causing it to:
- Expand
- Become less dense
- Carry slightly less energy per litre
You get the same volume, but actually less real energy.
Night Fuel (More Dense, Better Value)
At night, the temperature drops.
Fuel becomes denser and more stable.
So you receive:
- The same measured litres
- More energy packed into each litre
- Better overall value for your money
This is why industries like aviation, shipping, and manufacturing measure fuel by mass, not volume.
Why Does This Matter for YOU?
Even though the difference is small, over time:
- Car owners save money
- Truck drivers save even more
- Fleet operators save massively
And understanding this alone puts you ahead of 99% of drivers on the road.
Follow GH Educate for more real science, real engineering, and real-world explanations.
