I bought a new Sierra in March it does not get as good milage as my Yukon did. It has a 5.3 with fuel managment and 3.42 rear gears.And is a crew cab. it got 18.6 mpg on a 1400 mile trip. Did not pull a trailer, is this common milage for this truck ?

 

How many miles are on it? Sometimes, it takes a while to get it broken in and loosened up...

 

It just turned 3800 miles. Thanks for your reply

 

Give it another 2,500 miles and see if it doesn't get better... You can do some mods...[sm=icon_stickpoke.gif]