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post #1 of (permalink) Old 03-17-2008, 11:04 PM Thread Starter
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Gas Volume vs Temp

This is a pretty good article on the issue of gas volume vs temperature.

Gas vs Temp

I have NOT verified the accuracy.

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post #2 of (permalink) Old 03-18-2008, 12:43 PM
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With only a quick scan of the article, yes what they state is likely correct. However, while it is one way to take advantage of the customers, there is nothing wrong with it. When purchasing gasoline at the pump, one is paying for the volume of gasoline. One gallon at 6 AM may not have the same energy as one gallon at 3 PM but you are still purchasing one gallon of fuel.

This is similar to the time when they change from summer fuel specifications to winter specifications. For winter fuel, more butane is blended into the fuel to help cold starts. However if it happens to get warm in January, then that butane flashes off when you remove the filler cap.

Since we pay for gas when it is purchased, a gallon is a gallon. What it actually is when we use it depends on nature. But we have not found a way to control that yet.

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post #3 of (permalink) Old 03-18-2008, 05:50 PM
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Quote:
Originally Posted by Mark2003 View Post
With only a quick scan of the article, yes what they state is likely correct. However, while it is one way to take advantage of the customers, there is nothing wrong with it. When purchasing gasoline at the pump, one is paying for the volume of gasoline. One gallon at 6 AM may not have the same energy as one gallon at 3 PM but you are still purchasing one gallon of fuel.

This is similar to the time when they change from summer fuel specifications to winter specifications. For winter fuel, more butane is blended into the fuel to help cold starts. However if it happens to get warm in January, then that butane flashes off when you remove the filler cap.

Since we pay for gas when it is purchased, a gallon is a gallon. What it actually is when we use it depends on nature. But we have not found a way to control that yet.

There is a quite simple way to rectify the issue, the energy industry just chooses not to do so, and that is to not sell fuel by gallon but sell it by the pound. The energy content of a gallon of fuel changes (literally) with the weather but a pound of fuel has the same energy content regardless.

This is why aircraft measure fuel in pounds instead of gallons. X amount of pounds of fuel gets you X amount of distance always, where range based on gallons fluctuates a fair amount, especially when you are talking 1000s of gallons.
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