Does diesel expand in warm weather?

[Mattk]

When I got in my car this morning the temp was about 15'c and my fuel level was on the bottom of the gauge.When I got in it again after work when the temp was about 24'c it was slightly higher up the gauge.On both occasions I had not started the engine so was checking under similar criteria.

So does diesel expand when warmer and if so do you get more for your money refuelling when hot?

[sddsddean]

Just like any liquid, diesel expands when it warms up. Stocks at your local petrol station can go up several hundred gallons in warm weather as it expands in the storage tanks. You would be better to buy your fuel on a freezing cold morning, as by the warmer daytime, your fuel will have expanded, giving you some for free.
In road tankers, you never 'fill to the brim' as you have to leave an ullage space. This is an air space that is available for the liquid to expand into.

[Toureman]

Nearly everything expands in when it gets warm.

The energy in 1 gallon of fuel, diesel or petrol, will produce a certain amount of energy.

If expanded diesel ( when the fuel is warmer) will give you more energy where does this extra energy come from?

Why don't car makers put a small heater in the tank so giving more MPG from their cars?

??

[Panic Button]

I had heard Martin Lewis from moneysaving .com suggesting fuelling when it is cold.

However surely as the tanks are underground they will stay at a pretty even temperature.

Also the expansion of 40 litres is hardly going to be a big saving.