On October 15, 2007, the following data presented in the Annual Energy Outlook 2007 was updated:
1. Two numbers
on page 59 (first column) of the Issues in Focus Chapter in the AEO2007 text
needs to be corrected
as indicated
by the following underlined values:
- The third paragraph
should read:
E10 (10 percent ethanol) has 3.3 percent less energy content per gallon
than conventional gasoline. E85 (which currently averages 74 percent ethanol
by volume) has 24.1 percent less energy per gallon than conventional gasoline.
AEO2007 assumes that engine thermal efficiency remains the same whether
the vehicle burns conventional gasoline, E10, or E85. This means that 1.03
gallons of E10 or 1.32 gallons of E85 are needed for a vehicle to cover
the same distance that it would with a gallon of conventional gasoline.
Although the difference is not expected to have a significant effect on
purchases of E10, AEO2007 assumes that motorists whose vehicles are able
to run on E85 or conventional gasoline will compare the two fuels on the
basis of price per unit of energy.
2. Table 12. Energy content of biofuels should be corrected as follows:
Fuel |
Btu per gallon
(low heating value) |
Btu per gallon
(high heating value) |
Gallons of gasoline equivalent
(high heating value) |
Conventional Gasoline |
115,500 |
125,071 |
1.00 |
Fuel ethanol (E100) |
76,000 |
84,262 |
0.67 |
E85 (74% blend on average) |
-- |
94,872 |
0.76 |
Distillate fuel oil (diesel) |
128,500 |
138,690 |
1.11 |
Biodiesel (B100) |
118,296 |
128,520 |
1.03 |
On October 16, 2007, the following data presented in the Annual Energy Outlook 2007 was updated:
3. Two numbers
on page 8 (first column) of the Overview Chapter in the AEO2007 text
needs to be corrected
as indicated
by the following underlined values:
- The third paragraph
should read:
Total consumption of marketed renewable fuels in the AEO2007 reference case (including ethanol for gasoline blending, of which 1.2 quadrillion Btu in 2030 is included with liquid fuels consumption) is projected to grow from 6.2 quadrillion Btu in 2005 to 9.9 quadrillion Btu in 2030 (Figure 3). The robust growth is a result of State renewable portfolio standard (RPS) programs, mandates, and goals for renewable electricity generation; technological advances; high petroleum and natural gas prices; and Federal tax credits, including those in EPACT2005.
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