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NEWBEE second post- I have a 2004 Tahoe LT (just turned over 50K) with the tri zone auto temp control. Two weeks ago I noticed that running both the driver side and passanger side 60F, the back off. Driver side was blowing 60F and passanger was blowing 90F. I was worried at first but the...

GREENGUMBY, Thank you for posting. Question, Who is responsible for the cost of the repair? :umn:

I had problems on a Ford and a Jeep G.C. with pre-ignition & knock/pinging during warmer months. I ran the 87 in the HOE for 2 tanks and avg MPG according to the display was only 11.8. Switched to the 91 and went up to 12.6. not a huge gain, but a gain none the less. Same drive and speed...

Thank you for the reply and I'll have to check the exhaust out. I'm currently running 91 octane From BP/Amoco. This is after running a couple of tanks or 87 as well as 89 with 10% ethanol. I was told by the dealership not to run the ethanol, Just run 87 Octane and not to worry about it. I...

Newbie - first post. I just purchased a 04 5.3L Hoe with 42,000 miles on her. Use to be a F#$( guy, but have since seen the light with this vehicle. I have two minor issues fuel economy and a deep pinging(see below). I know why I get bad fuel economy to heavy of a foot. Love the power...