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Fuel Mileage - 2007 Silverado

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jrjohnson966 Enthusiast

jrjohnson966

Posted
Posted

Only have 3500 miles on 2007 Silverado NBS, but getting about 18.5 mpg if all highway. A mix of highway and city knocks it down to around 16 mpg. All city driving is resulting in about 14 mpg. These figures are coming from actual calculations using miles/gals and not what the DIC is showing. The DIC has been showing slightly higher mpg numbers. I towed my 22' travel trailer, about 4500# loaded, for the first time with the new truck last month on a 1150 mile trip with all but 50 miles driven on the Interstate with mpg ranging from 8.5-9.7.

07-Z71 Enthusiast

07-Z71

Posted
Posted

it sucks.. the active fuel managment doesn't do a d**n thing in my option. My 05 get got better mileage then my 07.. I probably get 15-15.5 in the city

dzyuba Enthusiast

dzyuba

Posted
Posted

I usually average about 15-16 mpg on normal weeks, which is mostly city with plenty of traffic. Last weekend I went on a 300 mile round trip and got about 21 mpg (going 65 mph+ most of the time). I have close to 10,000 miles on the odometer.

 

I do all my calculations by hand which are usually close to the DIC reading with the DIC being a bit higher (0.5 to 1 mpg).

Zembonez Senior Enthusiast

Zembonez

Posted
Posted

With an EPA rating of 16 and 20 on most of our trucks, I don't see how many of us can complain. It was fairly obvious these weren't Honda Civics when we bought em.

cide1 Enthusiast

cide1

Posted
Posted

This is a question that I think about constantly. Being an engineer, I always try to get the most efficiency out of my machines.

 

I bought my 2007 in August, and have driven it 5300 miles. It's a crew cab, 5.3L, not flex-fuel, with 3.73 rear end, 2wd. I have averaged 18.7 over the life of the truck. I drive from Indiana to Minnesota about once a month for about 1200 miles round trip, and get 22 to 23 mpg on a tank on the highway going exactly the speed limit, windows up, A/C off, trying to avoid touching cruise control. Cruise control helps mileage dramatically, as does flat terrain. I have found that going anywhere between 55 and 70 on flat roads yields about the same mileage. I also take my time coming up to speed when merging onto the highway.

 

I will stay in 4 cylinder mode so long, that it must switch back to 8 cylinder mode to charge the battery. I can watch my voltmeter go from 14.3 down to about 12.5 volts before it goes back to 8 cylinder mode. First time it did it, I used the onstar button to get connected with the local service center, cause I thought my charging system was broken. They told me that it does not charge the battery in 4 cylinder mode, and this behavior was normal.

 

Around town I get 16.5 to 17 mpg. My very first tank which was mostly around town was about 15.5 mpg.

 

I traded in a 1998 Honda CR-V with 124,000 miles to buy the Sierra. Its 2.0 Liter engine with 124 horsepower got 24 mpg on the highway, sometimes 25.

 

Overall, I think the mileage is fantastic for such a large vehicle with so much power.

BAD2500HD Enthusiast

BAD2500HD

Posted
Posted

Getting 16.8 mpg with mine but i only drive 10miles round trip to work and back but when i take it to the big city about 18miles one way it goes up to 17.1 and will stay there for about a week , i've got just over 1,100 miles on mine now and sofar the "DIC" has been right on with the mpg.

hubbycap Senior Enthusiast

hubbycap

Posted
Posted
With an EPA rating of 16 and 20 on most of our trucks, I don't see how many of us can complain. It was fairly obvious these weren't Honda Civics when we bought em.

 

 

I wonder what a civic's mpg would be if it weighed 5000 lbs?

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