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Discussion Starter · #1 ·
Hello 355 Nation!
Been using this forum for months now as I've just picked up a 2009 Colorado. Thank you for all your information!!!! The truck has 84000kms. Yes you read correctly kms.
4x4 i5 3.7 Z71 Crew Cab. Dark Grey.
265 70 17 k02 - tire pressure is perfect on all 4.
2" torsion bar lift front, 2" shackle lift on back.
I use regular gas, nothing special.

I'm getting about 400km/250m on a full tank. That's 21.5l/100km / 10.9mpg. I do 70% highway 30% city/town driving.

I'm convinced this isn't good and I can get better. I just had my exhaust manifold gasket replaced. The mechanic said that could have been messing with an 02 sensor but I'm still getting the same fuel economy ( stated above ). What can I do ? I absolutely love my truck and want it to last.

Help me 355 nation
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Discussion Starter · #3 ·
Welcome to the Nation.
Find someone with a scan tool that can read live data and have them check short term/long term fuel trims and O2 sensor readings. The mileage is a bit low to expect a deteriorated O2 sensor, but it could be defective. Are those stock size tires? Find a phone app that shows speed and compare the reading with your speedometer.
Ok thank you. I'll will try this! And yes I believe there are stock tire sizes ( I see the psi sticker on the inside of the door and it's listed ).
 

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Discussion Starter · #5 ·
Yeah, if the size is on the door frame decal, they would be stock. That is real low mileage for a 12 year old truck. Do you know the history?
It really is in amazing shape. Bought it this past summer from a couple that work in the oil fields in the west coast of Canada. They owned 5 vehicles. The owner has every single receipt for every oil change, tire rotation, etc. This is a real gem. Worth it to me to replace some parts if I can get better gas mileage.... O2 sensors, spark plugs, coils, engine tune, etc... I just don't know if any of this stuff really helps. Do you have any experience or knowledge with any of those replacements?
 
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