JCW and Prime

Thats crazy. I can't even break 6s empty. I'm starting to think somethings messing it up on the truck. Either that or my mpg display.

 

Wow seebs! Get that looked at. Even my full-size weighing over 76,000 is getting in the 6's goin through all the hills.

 

Oooooo I know the secret!!! Kind of lol

 

How fast are you driving and what rpms are you shifting at apparently it plays a big part in good mpg if you are doing everything right you may have a truck problem or like you said its not reading properly...did you check to see what the qc says you are getting

 

It does. Try shifting lower, I was told around 12-1300. I've been running at 58mph mainly. My truck seems to do really good at 60 though. Need the momentum so I could make it up hills

 

And that's at governed 57, right?

 

Stay off of the throttle (like on entrance ramps,) don't leave the jake engaged all the time - use gravity to your advantage. Watch your weight... you want a little more on the drives. And slow down... if you think your truck is getting better mileage at 60 than at 55 you've got a mechanical problem. Progressive shifting when possible... keep your RPMs below 1200 as much as possible, turbo boost below 10 PSI as much as possible. Don't delay downshifting on a hard pull... you're just burning up a lot more fuel that way.

TIRE PRESSURE! TIRE PRESSURE! TIRE PRESSURE!

Hint: Get a notebook and keep track of your mileage. Learn from it.