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I'm getting raped on mileage

shuug

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shuug Enthusiast

shuug

Posted
Posted

My duramax is getting 11.5 mpg. I have 287 75 16's on it and I'm thinking maybe the computer is sensative and I need to get it recalibrated?

 

Also, I'm ordering the edge juice 125hp and was wondering if I also have to get a new exhaust? If I need I new exhaust what kind should I get? I want it to whistle...

 

thanks

Shaners Senior Enthusiast

Shaners

Posted
Posted

When you figure out your milage do you consider the fact that your speedo/odo may be off as much as 6% over the stock 245/75's? The larger tires are heavier and will have more rolling resistance, but your MPG's should be better than what you're getting.

 

A recalibration should move you shift points back to optimum, and that may help your MPG's.

Frank S Senior Enthusiast

Frank S

Posted
Posted
My duramax is getting 11.5 mpg. I have 287 75 16's on it and I'm thinking maybe the computer is sensative and I need to get it recalibrated?

 

Also, I'm ordering the edge juice 125hp and was wondering if I also have to get a new exhaust? If I need I new exhaust what kind should I get? I want it to whistle...

 

thanks

Definitely go with a new down pipe-back exhaust to keep your EGT's from getting too high.

 

Don't know on the problem but I'd get it checked before juicing the truck.

rascal Enthusiast

rascal

Posted
Posted
My Silverado with the 6.0 gets mainly 8city and 15highway, Bravada with 4.2 is at 13.9city.........now you know why we got a Vibe for runnin around!

what kinda mods have you did?

01silverado2500 Enthusiast

01silverado2500

Posted
Posted

Both are stock, they just make short trips and the roads are hilly here in western PA. The truck is stock 4x4 with the 6.0 and 4.10 gears. Bravada is stock with AWD and 3.73 gears. Ive had a few other big chevys with 350s in them and got close to the same mpg. Both the truck and Bravy are big and heavy so I just have to feed them.

Machine Enthusiast

Machine

Posted
Posted

An adjusted 11.5-mpg is not really normal for a DMax... Best to have that one checked out before adding any type of power mod. It’s probably not an injector issue. If it was, you would have many more problems than just some $hitty mpg’s

 

Regarding the Edge Juice…. Even more important than the 4” aftermarket exhaust are GUAGES. But it sounds like you’re getting the Juice with the Attitude controller, yes? If not, check into the gauges before adding a power mod.

 

Some good 4” exhausts are Banks, DPPI, Quadzilla, and Bully Dog. I have the DPPI 4” w/ the 5” tip and it’s a very good system. Don’t expect to hear too much turbo “whistle” with any of these, though. The DMax turbo doesn’t sing as loud as the new 6.0 Ford PS’s with 4” pipes. The ’03 Fords sound like an F-16 coming down the road. The 04’s and 05’s are a little more subdued

Machine Enthusiast

Machine

Posted
Posted
Those mpgs are not normal. Like someone said, your speedometer could be off.

 

Machine, are you going to do anything to your new PSD?

Hi –

 

Yes, next week it’s going to Dallas to have a 4.5” suspension lift installed. It’ll sit on 315’s. As far as the engine - I know Quad at Quadzilla, so I’ll probably run one of his programmers until I figure out what the best combination for power and reliability is. I run his programmer on my Duramax and it’s been a good performer.

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