is it true that you should fill your car with gas early in the morning?

this myth has been around since the late 40's when gasoline storage tanks were just starting to be buried underground. in the early days the tanks were buried just below the surface, and thus temperature did have an effect of the volume of fuel in the tank, but mostly due to the amount of vapor released due to the higher temperatures. these days the storage tanks are buried much deeper to the point where the tanks are kept at a steady 55 degrees regardless of outside temperature, and thus has no meaning these days.

No. The theory is that liquids will be denser at lower temperatures, however fuel stored underground is at a pretty constant temperature no matter how hot or cold it is. If you had to queue for 2 seconds because the driver in front had the same idea you would have burnt more fuel than you saved if the theory was true!. Keep a light right foot and plan ahead - you will save fuel and have a more relaxing trip.

the underground pemprature of the fuel is fairly regular, the change in temprature on an avreage day wouldn't be noticable, the asker of the question ommited to mention, that vapourising liquid reduces the ambiant temprature same as a refridgerator dose

mith BUSTED

that seems completely unreasonable, because sure in the beginning when the gas is "compacted" in the cold underground, then by the time its afternoon your car will be out in the hot sun, and the gas will no longer be in a cool environment, and dont you think that gas will start to expand and possibly blow?

I did that once, then parked a few blocks later for a couple of hours. I came back to find the heated gasoline squirting out around my fuel cap! So on a day that is going to warm up, I don't fill unless I'll be driving for a significant distance to use up some of the gas that will expand when it gets warmer.

I've heard that too that you should only fuel up in the morning. I've also heard that you should not fuel up while the tanks are being filled or what until your tank is on empty because it stirs up any debris at the bottom of the tank which could be carried into your engine.

yes its true because in the morning compacity is smaller

Yes it's true. The paragraph explains it completely, so yeah. I've heard this from my teachers too, so I know it's true. But you can also buy it at night because it cools down, but not all the way, so in the morning would be the right time.

yes, always fill up your car in the morning, it is true.