I have an 06 lbz with afe straight pipe and intake sinister egr delete and a bully dog set on fuel Econ. Has 35 inch tires and weighs 10,000 pounds and gets 11 mpg. I put the exact same modifications on another lbz with the same weight but smaller tires resulting in 21mpg. Any thoughts on what I could be forgetting or messed up? I'm not a tool bag looking for lope tunes and black smoke I'd just like my fuel receipts to be lower haha
Lbz fuel milage
- Thread starter 100571
- Start date
10k 
is that the truck only??? must be a medium duty ?? because mine is 7100LBS. first of all get rid of the 35 if you want better MPG`s, drive slower and coast to a stop, if you are carrying 3k lbs of stuff get rid on the weight
http://www.duramaxdiesels.com/forum/showthread.php?t=58463 this guy has a CC DRW and he weights 7300
is that the truck only??? must be a medium duty ?? because mine is 7100LBS. first of all get rid of the 35 if you want better MPG`s, drive slower and coast to a stop, if you are carrying 3k lbs of stuff get rid on the weighthttp://www.duramaxdiesels.com/forum/showthread.php?t=58463 this guy has a CC DRW and he weights 7300
I can't remove the weight it's my work truck. The other guys are getting way better with 33's I just figured I'd see if anyone on here knew anything else to try
35s and a 6 speed lbz puts you pretty low in in the power curve at highway speeds. Especially for that weight. Maybe try keeping it in 5th and lockout 6th for a tank. If mileage goes up smaller tires are one way to bump mileage.
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Its your driving style or there is something mechanically wrong with the truck. The only time I see mileage that low on a diesel is when I'm idling a lot, towing or there is something wrong. Yes my work truck is at about 10K it just doesn't have 35s, but its a 6.4 F250. They get the worse mileage of any diesel pickup I have seen and I still can get over 12 for the most part.
You could try this especially in town, T/H M-mode 4th gear. I run my truck this way and it keep he RPM right at about 1700-2000 @ 45mph good for up to 55mph (70 if I'm toying with someone) in town driving, and like one of the other members said you have no need for 6th even on the freeway as you will be well below the power curve cruising at 65-70mph, mine seems to have a nice smooth spot around 1700-2000rpm. Some say it is lower but the truck just has a tone about the motor that just sounds right and I have about 1600lbs in the bed.
I pulled 10k on a trip to Texas putting my gross around 17k and got 12.5-13 on every tank. Its either tires or somethings wrong with the truck.
Are you hand calculating mileage, and adjusting for the larger tires effect on the speedometer/odometer?