1st trick: fill up early in the morning.The room temperature and the soil is lower. All service stations have their deposits under the ground. To be more cold Earth, the density of gasoline and diesel fuel is smaller. The opposite happens during the day, the soil temperature rises, and fuels tend to expand. For this last, if you fill the tank at noon, in the afternoon or in the evening, the liter of fuel won’t a litre exactly.
In the petroleum industry, specific gravity and a soil temperature, they play a very important role. Where I work, each load of fuel in the truck is carefully controlled in regards to the temperature. For every gallon poured in the tank of the truck to be exact. 2Nd trick: when filling the tank, do not tighten the handle of the spout to the maximum. According to the pressure that is exerted on the handle, spout speed may be slow, medium, or high. Always choose the slower mode, and will save more money. Dispensing more slowly, creates less steam, and most parts of the landfill becomes a full effective. All spraying hoses return the steam to the tank.
If they fill the tank by squeezing the handle to maximize a certain percentage of the precious liquid that enters the tank turns into steam and returns by the end of the spout hose to the reservoir of the station. Whereupon, get less fuel for the same money. 3rd trick: fill the tank until the lower half. While most fuel is in the tank, less air there is in it. The fuel evaporates more quickly than you think. The large refineries tanker deposits have floating ceilings inside, while maintaining the separate air fuel, with the objective of maintaining the evaporation to a minimum. 4Th trick: do not fill the tank when the petrol tanks are refilling or immediately after. If you reaches the service station and sees a truck tanker that is filling the tanks underground of the same, or just them filling, avoid, if you can refuel on that station at that time. To fill tanks, remove remaining fuel in them and the bottom sediment. So you run the risk of fuelling dirty.