C.G. and Speration point

[PJ_Godzilla]

Depends on the temperature.  

JG, I've see the mud on the back of your neck. 

And, actually, I think gas will vary from about .72-.75 specific weight. Part of that variation has got to do with blend variation.

You point out an interesting thing, also, that is frequently overlooking: liquids, while still "incompressible", generally still have thermal expansion coeffs.

[earl1937]

And, actually, I think gas will vary from about .72-.75 specific weight. Part of that variation has got to do with blend variation.

You point out an interesting thing, also, that is frequently overlooking: liquids, while still "incompressible", generally still have thermal expansion coeffs.

If you know the specific gravity (relative density) of a liquid, such as gasoline, you can determine the weight per gallon by multiplying the specific gravity by 8.34 lb/gal (the weight of pure water).  Gasoline has a specific gravity of 0.71 - 0.77. Multiplying those numbers by 8.34 lb/gal and you come up with a range of 5.921 lb/gal - 6.422 lb/gal.
For purposes of weight and balance computations, I have always used 6 and 1/2 pounds per galleon, even though if you do the math, it is usually 6.15 pounds per gal. Gave us a "fudge" factor on reserves.

[morfiend]

Depends on the temperature.  

JG, I've see the mud on the back of your neck. 

 This is why all gas pumps state the volume@ a temp!     Always buy gas during the coolest part of the day!