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1484 Views 14 Replies 9 Participants Last post by  Method2Madness
So, I've spent the past hour searching and mulling through the site trying to get a solid answer, but have come up a bit short.

I just bought a 2011 Colorado 2.9l, 4sp auto ext cab on stock tires. Only mods are k&n cai and some weird sounding magnaflow exhaust. I have a bed cover also. The truck is in mint condition, runs perfectly and has been well maintained as far as I can tell. 68,500 miles.

The issue im having is with fuel mileage. Im thinking its a bit low. I've gone 150 miles and am right at half a tank. I've run the ac/defrost a bit and the transmission gearing on this thing is a bit wonky, so sometimes you have to get on it to make it downshift in order to maintain 70mph. Given this, does 150 miles on half a tank sound a bit low to you guys?

What are you with the 2.9 seeing at half a tank?

I know from my search, mpg is a hot topic and I'm not trying to beat a dead horse. I'm just a bit concerned as I have a 30 day, 100 percent warranty, and 3yr/36000 mile warranty after that, and if something's wrong, I wanna get it looked at by one of the techs at work (I work for the dealership where I bought it)

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2012 Crew cab Z71 4x4
5.3l auto 4.10 gears
265/65 R18 tires

Volant CAI
Supermodulation PTB
Custom cat back exhaust 1 in 2 out Magnaflo
Diablo intune running economy tune (getting lined up for supermod remote tune)

Fill up with Shell 87
full to 3/4 - 100 miles
3/4 to 1/2 - 100 miles
1/2 to 1/4 - 95 miles
1/4 to 1/8 - 20 miles

16.416 gallon needed to top off = 19.188 MPG

Mileage was 70 percent Highway running 70 to 75 (speed limit 65 to 70) running 5 over.
30 percent city 35 to 55 with a lot of red lights.

Can't complain
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