Gas Mileage

reidrhollander · February 14, 2011

I keep seeing people on here claiming they are getting 17-18 on the highway and 14-15 in town. I commute 35 miles each way to work everyday that is all highway and have never reset the fuel economy computer in the 18 months since I bought the truck new. With 80% of my driving on a 4 lane highway it still says I am only getting 14 MPG.

Wolfmansbrudda · February 14, 2011

According to my dash display I get an average of 15.3 mpg on my '07 Silverado 5.3L with (I'm estimating here) roughly 40% hwy and 60% city driving.

Mckenzie · February 14, 2011

I get 10-12 MPG on stop and go, and on a 300 mile interstate trip i get about 15 with the cruise on.

If i had smaller tires and got rid of my winch,brushguard, toolbox, and subs and then put some smaller tires on then i'd probably get a 2 more mpg.

If i had long tube headers, a blackbear tune, and new CAI, and then some new plugs and wires, then i might get 3-4 more mpg

8.1HD/ALLISON · February 14, 2011

I keep seeing people on here claiming they are getting 17-18 on the highway and 14-15 in town. I commute 35 miles each way to work everyday that is all highway and have never reset the fuel economy computer in the 18 months since I bought the truck new. With 80% of my driving on a 4 lane highway it still says I am only getting 14 MPG.

You should reset the fuel economy when you fill up.

countryboy_db · February 14, 2011

I know im comparing apples to oranges, different model trucks and all but im only getting 11 city/ 13.6 highway. Id be tickled with an average of 14. But then again its a truck you cant expect it to get great gas mileage.

K1500Tech · February 14, 2011

I'm getting 15 mpg mixed driving

LeoS41280 · February 14, 2011

You should reset the fuel economy when you fill up.

Just wondering why you say that? Mine was last reset 12/20/2008. About 15,000 miles ago. My DIC says 15.8 mpg. Thats about 40% hiway 60% city. I have a 5.3 4 spd w/AFM that changes between 4cyl and 8cyl seamlessly. And 3.42 gears.

pwall · February 14, 2011

A lot has to do with your speed.....stating the obvious aren't I.

For example, in my truck (although it's diesel but that doesn't matter for this example), if I travel at 60mph, I can get 20mpg easy. At 55mph, 22mph. At 70mph (what I travel at the most), 17mpg.

So I guess I can claim anywhere between 17mpg-22mpg highway.

redvett · February 14, 2011

He said that because its a quote from the Owners manual. Lots of informative reading in there, try it.

You should reset the fuel economy when you fill up.

Just wondering why you say that? Mine was last reset 12/20/2008. About 15,000 miles ago. My DIC says 15.8 mpg. Thats about 40% hiway 60% city. I have a 5.3 4 spd w/AFM that changes between 4cyl and 8cyl seamlessly. And 3.42 gears.

music · February 14, 2011

OP: Where do you live, and how do you drive? Also, what motor/transmission?

txab · February 14, 2011

I keep seeing people on here claiming they are getting 17-18 on the highway and 14-15 in town. I commute 35 miles each way to work everyday that is all highway and have never reset the fuel economy computer in the 18 months since I bought the truck new. With 80% of my driving on a 4 lane highway it still says I am only getting 14 MPG.

Have you ever done a manual calculation of MPG?

Answer up on your rear gear ratio, engine size, and trans type. I get 18 -19 highway with avg conditions. 15.8 city. That's with a 3.73, no AFM and BB tune, which sometimes makes it hard to drive conservatively.

MaverickZ71 · February 14, 2011

My 2009 crew cab Z71 4x4 with 5.3L AFM V8 and 6-speed auto, 3.42 gears, has never quite gotten gas mileage as good as advertised on original sticker, and I'm easy on the gas pedal and the brakes in this truck. [Hammer down in the T/A, though ] (In summer, I get actual 13 in town, 17 on hwy, avg 15 overall; not 14 city and 20 hwy shown on sticker.) Granted, I do use the remote start in the winter, and it runs more like 11 city/17 hwy then. Also, I've found the instant & avg fuel mileage and gallons used shown in the DIC are always 20% overoptimistic from my actual calculations.

mybaby2500 · February 14, 2011

I get 10 around town and 12 hwy. I'm also at 5000ft. Thats with 6.0L, 4.10 gears, lift, tires, CAI, and a heavy foot. At 65mph I could get 13.5 but 80mph is worth the extra gas.