New Silverado 1500

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.

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

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.

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

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.

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