I have a 03 Silverado 6.0 4L80 4X4. I am towing a 6 X 12 enclosed trailer to SoCal on Monday (12 Jan) and want to see if there can be some changes to my tune to get a little better MPG. I have attached my current tune and a couple scans. I wanted to do a WBO2 scan but I have not heard back from PLX Tech Dept.

LS1B_0041.efi
LS1B_0042.efi
2003 Chevrolet 2500 HD LT 6.0L Auto 4X4 LS1B (OS 12593058) 2015 01-Jan 07.ctz