New Silverado 1500

Probably not much. How's your truck configured and what sort of mileage are you seeing?

Need more info....

What are getting now for MPG?

How many miles?

What motor?

I was getting 12MPG on the lousy winter blend, 14 otherwise. Mostly city driving. Could easily get 20+ highway driving.

1500 crew cab 4x4 with the 5.3l V-8 just got it less than 20 miles
showing about 8 MPG

Drive the thing. On a 2015 Rental 5.3 Suburban I got 22 hwy...forget about the lie o meter for now and just drive.

JimVan wrote:
1500 crew cab 4x4 with the 5.3l V-8 just got it less than 20 miles
showing about 8 MPG

Yours will certainly do better than that! You must be doing town miles, in cold weather, and burning winter gas, so worst case.

I've purchased 9 new trucks over the years, and though I'm not one to check closely, I've never really noticed much improvement after break-in.

Jerry

20 miles isn't even warmed up really. Give it another 500 miles at least to get a feel for the mileage it will actually get.

After only 20 miles neither you nor the computer have any remote idea what fuel mileage you're getting. That's too small a sample to be even slightly accurate.
Our new 2015 Chevy 3500 at work get's about 11 mpg loaded to 9,000 pounds with the 6.0 and 4:10 gears. After 10,000 miles it may be creeping up to 12 mpg.

Thanks to all, for your help.

Have you tried resetting the avg mileage readout since you got it?

When I test drove my 2wd max tow with 3.73, it had 5 miles on it. I put on a few more during my test drive, and it showed something like 7 mpg. Well, I thought about it and realized that it had a service life of cold starts and being shut down. Right off the factory floor, parked in the factory lot, started up again, run over to the rail yard, off and up onto the rail car, to the transporter, to the dealer, dealer prep, out to the sales lot, one test drive before me, my test drive... Lucky to have gotten what it did with all the cold starts, heavy acceleration, etc.

Limiting cold starts and idling where possible, I have gotten 25 mpg going 5 over the speed limit on a 100 mile loop 90% highway and freeway with speeds of about 1/2 @ 60 and the other half @ 70mph through rolling terrain with a several miles of 6% grade. I usually get 20 - 23mpg when not driving for mileage on the highway.

The mileage in this vehicle is very dependent on the way the driver drives and uses the throttle. Use the DIC and try to keep the truck in 4cyl mode as much as you can if you are looking for mpg. My low axle ratio probably helps me in that regard as I'm surrounded by hills and mountains in the valley where I live. With that said, it can be quite a pig when driven moderately hard. Best 400 mile average I had was 20.4 mpg with 50/50 driving. Now I just enjoy the truck and pay the gas bill. Congrats, hope you enjoy yours.