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ways to save gas


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I've never heard of these before but it makes sense to me..?


1. Fill up your car or truck in the morning when the temperature is still cool. Remember that all service stations have their storage tanks buried below ground; and the colder the ground, the denser the gasoline. When it get s warmer gasoline expands, so if you're filling up in the afternoon or in the evening, what should be a gallon is not exactly a gallon. In the petroleum business, the specific gravity and temper ature of the fuel (gasoline, diesel, jet fuel, ethanol and other petroleum products) are significant. Every truckload that we load is temperature-compensated so that the indicated gallonage is actually the amount pumped. A one-degree rise in temperature is a big deal for businesses, but service stations don't have temperature compensation at their pumps .


2. If a tanker truck is filling the station's tank at the time you want to buy gas, do not fill up; most likely dirt and sludge in the tank is being stirred up when gas is being delivered, and you might be transferring that dirt from the bottom of their tank into your car's tank.


3. Fill up when your gas tank is half-full (or half-empty), because the more gas you have in your tank the less air there is and gasoline evaporates rapidly, especially when it's warm. (Gasoline storage tanks have an internal floating 'roof' membrane to act as a barrier between the gas and the atmosphere, thereby minimizing evaporation .)


4. If you look at the trigger you'll see that it has three delivery settings: slow, medium and high. When you're filling up do not squeeze the trigger of the nozzle to the high setting. You should be pumping at the slow setting, thereby minimizing vapors created while you are pumping. Hoses at the pump are corrugated; the corrugations act as a return path for vapor recovery ??' from gas that already has been metered. If you are pumping at the high setting, the agitated gasoline contains more vapor, which is being sucked back into the underground tank so you're getting less gas for your money

Hope this will help ease your 'pain at the pump'

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Yes, 1 3 and 4 are all known.


The catch with #1 is that it is true, but the temperature of underground storage tanks is usually a constant 55-65 degrees depending on what part of the country you live in. So the temp of the fuel you are pumping into your tank is generally not an issue. This is a good thing to do in general for air quality though. The fuel vapors more easily react with elements in the air at higher air temperatures and add to the low level ozone effects in the summer. i.e when you see the city issue air quality alerts, gas vapors are one of the contributing factors for that.


#3, well known issue as well for the exact reason you described above. Gas will only evaporate until it has saturated the air space. If you run the tank to empty you are adding more air space for gas to evaporate into. If you only allow the tank to be half empty then you are eliminating evaporation.


#4 Correct. The vapor return also intermingles with the reasons stated in #3. With a tank full of vapors and you pump in new fuel the gas station essentially gets to 'steal' back your vapor saturated air, let it re-condensate in the underground tanks and then resell it to other costumers.


All good points, unfortunately all three of these things added together is supposedly only beneficial for about 1/2 mpg increase or less depending on a variety of factors.

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