For regular gasoline, 125,000 BTU per US gallon
Yes. Kerosene has 140,000 btu's per gallon and gasoline has less.
Gasoline can generate roughly 20K BTU/lbm. There are 6 lbm per US gallon.
114,000 BTU/gallon
A gallon of gasoline contains about 132x106 joules of energy, which is equivalent to 125,000 BTU or 36,650 watt-hours:
114100 Btu
140,000 btu/gallon, nominal
BTU is an abbreviation for British Thermal Unit. This represents how much heat or energy is required to increase the temperature of 1 lb of water by 1 degree Fahrenheit. Gasoline, on average, creates between 115,000 and 125,000 BTUs. In contrast, ethanol creates about 75,000 BTUs.
Propylene has a lower heating value of approximately 21,500 BTU per gallon.
The energy content in fuels is often measured in BTU (British Thermal Units). I'm assuming that you're talking about compressed natural gas, as in the form that is used in some cars like the Honda Civic GX. One gallon of compressed natural gas contains 138,700 BTU. One gallon of gasoline contains 125,000 BTU. [http://www.bts.gov/publications/national_transportation_statistics/2002/html/table_04_06.html]
The internal combustion engine converts heat to motion or kinetic energy. Since ethanol has less "heat" than gasoline per gallon the fuel mileage will be less. Heat content of conventional gasoline = 115,500 Btu/gallon Heat content of ethanol = 76,000 Btu/gallon E85 is a blend of 15% gasoline and 85% ethanol so you can expect a drop in MPG of 20% or more.
While not as a chart, this is an idea about combustion energy values: Ethanol 77,000 Btu per gallon, Gasoline 125,000 Btu per gallon, Diesel 135,000 Btu per gallon and Biodiesel 130,000 Btu per gallon. Grades of fuel imply differences in composition and thus differences in combustion Btu values. Combustion values for ethanol will not depend on source of ethanol as long as ethanol content/composition is the same. Ali Hamza A_Hamza@yahoo.com