gmcjohnny67

Thank you I didnt think of u2 sensors my 01 around town got 10-12 but this 09 gets 8-9 I usually do complete tune ups when I get something new I got stuck working an honey do's on the weekend I'll try changing spark plugs sunday should I use the same plug or is there something better An 09 has 6.0l gas 350hp 6L80e trans Rear end 3:23 ratio 01 burb has 6.0l gas 275hp 4L80e trans Rear end 3:73 ratio

Ok I looked to see where 09 suburban would fit I couldn't fit a spot so I picked here I took my 01 suburban off the road the reduced engine mode problem was going to kill me well the wife said we are getting you another truck well it is an 09 suburban 2500 with 64300 miles I want to say it was a government vehicle because I see where the extra lights were mounted well to the question what should a 09 suburban 2500 with 6.0l gas get in fuel milage so far the best I got was 9 mpg I'm guessing something must be wrong