Driver information Center issues

In my driver information center read out I should be able to get a instant fuel mileage reading, however all I can get is average fuel mileage. Any ideas why this would not read this function. 2004 Chevy Avalanche
Thanks
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Hot Rod wrote:

basic DIC, in 2004 they dropped some features unless you get some of the higher option packages.
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All the buttons to operate it are on the steering wheel and this seems to be the only option that is not available
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Truck is loaded with every option that it came with in 04 except for the Z71 package
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