Quote:
Originally Posted by hp2g
HP2g is using by definition:
The U.S. liquid gallon is legally defined as 231 cubic inches,[1] and is equal to exactly 3.785 411 784 litres (1 L = 10−3 m3) or 0.133 680 555… cubic feet. This is the most common definition of a gallon in the United States. The U.S. fluid ounce is defined as 1/128 of a U.S. gallon.
British thermal unit (BTU or Btu) is a unit of energy used in the power, steam generation, heating and air conditioning industries. In scientific contexts the BTU has largely been replaced by the SI unit of energy, the joule (J), though it may be used as a measure of agricultural energy production (BTU/kg).
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With respect to the automotive community,a gallon of fuel is more accurately defined by a unit mass at around say 6.215 pounds per gallon for gasoline,and an average heating value of around 18,400 Btus per gallon(gasoline).Mass is considered more accurate do to the thermal expansion/contraction characteristics of the fuel.------------- I believe the definition of a Btu,is the heat energy required to raise one pound of water,one degree F,from 60-degrees F.------------- The alternate fuels legislation which was passed in the 1980s allowed automakers to use a special fudge-factor in calculating fleet CAFE.If memory serves me correctly,a car which had 22 mpg fuel economy,using E-85 or M-85,would be granted a CAFE rating of 135-mpg for purposes of calculating fleet average.The allowance was for internal auditing purposes and never intended to suggest that a flex-fuel vehicle could possibly attain 135-mpg.It is my opinion that anyone claiming 110-mpg for an "engine-swap" borders on the absurd and would justify extraordinary proof.And as the fellow has said,"Sir,you have stolen my property,burned my home,and raped my wife,but be warned,you may go to far."