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Re: horrible mpg on 03 yukon
Gears and a tune.
Seafoam is an engine cleaner. You suck it through your brake booster vacuum line into your intake and then your truck blows smoke like a satanic diesel. Pick a bottle up at your local parts store and follow the instructions.
1999 Tahoe LS 2-Door 4x4 w/ 3.73 G80. Custom tune from Justin @ Black Bear and a Vette 1 - 2 servo.
14 Bolt SF Project Underway
Proud member of the OBS Hood Whacker Club
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