GMC 2007 Yukon XL, Owner'S Manual

Page: 455 / 630

Fuel E85 (85% Ethanol)
The 8th digit of the Vehicle Identification Number
(VIN) shows the code letter or number that
identifies your vehicle’s engine. The VIN is at the
top left of the instrument panel. See Vehicle
Identification Number (VIN) on page 565.
If your vehicle has the 5.3L V8 engine (Code 0)
or the 5.3L V8 engine (Code 3), you can use
either regular unleaded gasoline or ethanol fuel
containing up to 85% ethanol (E85); also see
Fuel on page 452. In all other engines, use only
the unleaded gasoline described under Gasoline
Octane on page 453.
Only vehicles that have the 5.3L V8 engine
(Code 0) or the 5.3L V8 engine (Code 3) can use
85% ethanol fuel (E85). We encourage the use
of E85 in vehicles that are designed to use it.
The ethanol in E85 is a “renewable” fuel, meaning
it is made from renewable sources such as
corn and other crops.
Many service stations will not have an 85%
ethanol fuel (E85) pump available. The U. S.
Department of Energy has an alternative fuels
website (www.eere.energy.gov/afdc/infrastructure/
locator.html) that can help you find E85 fuel.
Those stations that do have E85 should have
a label indicating ethanol content. Do not use the
fuel if the ethanol content is greater than 85%.
At a minimum, E85 should meet ASTM
Specification D 5798. By definition, this means
that fuel labeled E85 will have an ethanol content
between 70% and 85%. Filling the fuel tank
with fuel mixtures that do not meet ASTM
specifications can affect driveability and could
cause the malfunction indicator lamp to come on.
To ensure quick starts in the wintertime, the E85
fuel must be formulated properly for your climate
according to ASTM specification D 5798. If you
have trouble starting on E85, it could be because
the E85 fuel is not properly formulated for your
climate. If this happens, switching to gasoline or
adding gasoline to the fuel tank can improve
starting. For good starting and heater efficiency
below 32°F (0°C), the fuel mix in the fuel tank
should contain no more than 70% ethanol. It is best
not to alternate repeatedly between gasoline and
E85. If you do switch fuels, it is recommended that
you add as much fuel as possible — do not add
less than three gallons (11 L) when refueling.
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