hey scott... did you write this?
A Costly Mistake at The Gas Pump You Can Avoid!
By: Scott Siegel
The costly mistake many drivers make when filling their car with gas is to overfill it by topping it off. When the gas pump nozzle clicks off, do you stop or do you keep pumping? Are you trying to add more gas your tank after the shutoff trying to stuff as much in as possible? Are you pumping more gas after the shutoff to round your total cost to the nearest full dollar amount? If either of these scenarios are true, or if any other reason causes you to top off your tank you have developed a bad habit that is costing you money and is contributing to air pollution.
Most gas stations are equipped with pumps that have vapor recovery systems to recover gas vapors keeping those vapors from getting into the air. If you top off your tank it will cause you to pay for gas that is drawn back into the gas station's vapor recovery system.
The extra gas you are trying to pump into your tank may just be drawn into the vapor line and back into the station's tanks. That means that you will be paying for gas that is not going into your car but is going back into the gas station's storage tanks. Of course the effect of this is to raise your cost of gas.
When you top off your tank there is a good chance that gas will evaporate or will be spilled on the ground. Both of these things will cost you money for gas that is not getting into your tank. That is it bad for your wallet.
There are more bad things that can happen when topping off your gas tank. Gasoline expands as it gets warmer. This is certainly important in the summer or in climates with warm weather. Gas in the station's underground tanks will be cooler than the air. As the gas in your tank warms up it expands. As the gasoline expands it needs more room.
If you overfill your car, there is no room for the fuel to expand. As the gas expands it has to go somewhere. It could easily find it's way into the vapor collection system of your own car. This may foul the vapor system causing it to malfunction.
The fuel that expands is lost gasoline that you have paid for. You paid for gas that you are not able to use. The result: your cost of gasoline goes up. But that is not the end of your increased costs! If the expanding fuel ends up in your car's vapor collection system it will negatively affect the system. If that occurs your vehicle will become much less efficient.
A vehicle that runs inefficiently burns more fuel which translates into spending more money on gas. That is a double hit in the wallet, once for the fuel that is lost directly and second for the additional gas your vehicle uses because it is running inefficiently.
Gas vapors are a major factor in adding toxic pollutants such as benzene to the air. This contributes to bad ozone days. Gas vapors are bad for your health and harmful to breathe. When you top off your tank you will end up with vapors released into the air. When this happens you are breathing in toxic fumes.
The next time you stop to fill your vehicle, when the pump stops don't try to add any more gas, your tank should be quite full. Don't overfill it! Don't top it off! You will save yourself fuel and money but you will also contribute to preserving your good health and preserving the environment!
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Originally Posted by AnclyT
