2005 gmc yukon denali 6.0 awd. 89 octane, mid grade fuel at 711/alon. . Avg about 14mpg at 70mph. 12mpg at 75mph. Where you put fuel also makes a difference on mine. Mpg drop when use Murphy usa, circle k, Valero or speedway. 91 octane makes no noticeable difference on mine.
I'm new here. Any updates on this fix. Both front seat heaters won't work. Only lights flash on and off. Both seats move fine. Adjustable pedal only moves about a 1/4 inch back and forth. Any help would be appreciated
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