Gas Mileage

tyhuck · February 15, 2011

I would think that the DIC mileage would be more accurate because it is monitoring so many things in the engine that you cant. Besides, most people dont fill their tanks up exactly the same every time. Just because I put 17.835 gallons in this time, doesnt mean that Im gonna put the exact same amount of gas in next time, or that I put that much in last time. Plus, the gas pumps can be off by at least 1/2 a gallon depending on the last time they were checked by the dept of agriculture (in TX). The did a story on some gas stations around here that were up to 4 gallons off on a fill-up (cant remember if it was on 10 gal or 20gal). To me thats where the variation would come in, not the computer that can acutally measure tha mount of fuel its putting into each cylinder. But, that may just make sense to me.

usafcajun · February 15, 2011

I'm getting about 14.7 mpg or 16L/100km in mostly city driving

im getting bout 14 with mostly city and some highway

usafcajun · February 15, 2011

I'm getting about 14.7 mpg or 16L/100km in mostly city driving

im getting bout 14 with city and a few highway

SqwkVFR · February 16, 2011

Another KS guy here.

2011 5.3 AFM / VVT 6 Spd 4x4 3.08's

Hwy cruise set at 74 - 19

City / some Hwy - 15-16

4HI TCS/ST off 12" snow on ground - 12.

All of the above waaaay better than my H2 which got 10-11 regardless.

StinkyCheese · February 16, 2011

I get 11.5-12 mpg mostly non highway. If I put cruise control on 65 and go for an entire tank I can get 14.9. All hand calculating. The DIC is pretty accurate usually it's only off by .5 mpg. Which makes sense since the fuel I use vs the fuel I put in is usually off by about 3/4 - 1 gallon. 2006 2500HD CC 6ft bed and a bed cap thingie. I'm going to assume I have the 4.10 rear end as the truck was bought for towing a 32ft holiday rambler.

DALE#3 · February 16, 2011

Ever check towing the BARGE?

tanked_darren · February 16, 2011

I get about 14L/100kms its actually becoming quite expensive (106km roundtrip to work) but I drove my moms G6 the other day and remembered how much I hate driving cars!

Snow White · February 17, 2011

30,000 on my 09 5.3l 4spd

i took 14lbs of air out of my tires for the snow and it dropped my mileage down 3-4mpg

remote start is a killer

low air pressure is a killer

head wind is a killer

hills are a killer

anything over 65 (with 3.73) is a killer

DALE#3 · February 17, 2011

I was just reading on other posts that the new 5.3 with 6spd.Are getting 20 mpg. on hway with 3.08 gears and towing is the balls.This is a full sz.truck with 4 whl.dr..No wonder the colorado are getting phrase out.Colorado is an awsume truck i'm on my second one can't believe the shit mileage i get with a smaller truck.The tranny and gear combo sucks hard.

music · February 17, 2011

anything over 65 (with 3.73) is a killer

That should be true, but I haven't noticed it on mine. Every long (non-towing) trip at limit+5 (avg ~70 mph) has given ~20 mpg. 4-spd/3.73 w/ the stock Goodyear AT tires. I'm beginning to think these tires are very efficient for an AT design, since most folks with street tires aren't showing much (if any) better.

kmborland · February 17, 2011

My dad's 04 cc 5.3 4x4 3.73 with 285s gets its best mileage around 68-73. He will get anywhere from 19-21mpg going that speed. I think 3.73 is the best gear to have with the 4l60e bc its a multi-purpose gear giving all around performance.

DALE#3 · February 17, 2011

2011 z71 v8 the only gear is 4.10 good for drag racing.Performance has a price.

tyhuck · February 17, 2011

My dad's 04 cc 5.3 4x4 3.73 with 285s gets its best mileage around 68-73. He will get anywhere from 19-21mpg going that speed. I think 3.73 is the best gear to have with the 4l60e bc its a multi-purpose gear giving all around performance.

Mine is like that with the 3.42 gears and stock size BFG ATs. My DIC show that I get better mileage from 55-60 or from about 68-72. Not sure why this is, but I can maintain about 16mpg at either range, but it seems that around 65, my mileage drops to 14.5mpg. Not sure whats up there.

DALE#3 · February 17, 2011

After a little more research the 2011 5.3 6spd.which is only available with the top$$ package.The cylinders cancel out depending on ecm readings.With a 3.08 rear that explains their 20 mpg. 1/2 ton 4 whl.dr. msrp.$40k depending on goodies.