The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

piecesparts · 12-30-2012, 08:27 PM

My 5.3 in my 2011 started at 18 to 19 MPG and it is still in that area. Standard cab, SWB, 5.3, 6 speed auto, 3.42 gears with 20" rims. I did a EFI Live tune and put headers on, and the mileage is still around 19 MPG UNLESS it is really cold outside, then it drops.

12-30-2012, 08:27 PM	#16
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Re: My 2012 GMC Sierra My 5.3 in my 2011 started at 18 to 19 MPG and it is still in that area. Standard cab, SWB, 5.3, 6 speed auto, 3.42 gears with 20" rims. I did a EFI Live tune and put headers on, and the mileage is still around 19 MPG UNLESS it is really cold outside, then it drops. __________________ Frank