I'm currently averageing 16-17mpg per tank. My average speed over each tank has been 36-37mph. The AWD 2004 5.3 Flex Fuel version is rated 13/14/17. I'm currently running e10-e15.
I drive mainly highway roads on my way to work. 20mi one way drive to work. Highest speedlimit I encounter is 55mph. I very rarely go over 57. Usually the cruise control is set to 55.
Last edited by Andrewhans; 02-03-2016 at 07:49 PM..
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