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Chevy/GMC Duramax 01-04 LB7 Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines

I have a 03 gmc 2500hd I have the muffler removed I'm only getting 13 mpg driving easy I put on an edge juice w/attitude and no change in mileage the dash says it getting 18 it's not right I pencil out 13 any ideas... JOIN NOW TO REMOVE TRACER

Lb7 fuel mileage

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Old 03-01-2013, 08:56 PM
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Default Lb7 fuel mileage

I have a 03 gmc 2500hd I have the muffler removed I'm only getting 13 mpg driving easy I put on an edge juice w/attitude and no change in mileage the dash says it getting 18 it's not right I pencil out 13 any ideas
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Old 03-03-2013, 08:01 PM
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How are the injectors? Fuel filter? Even as simple as your tires and tire pressures?

Hotforteacher's Sig:2002 Crew Cab Short bed 4x4 LB7. Air box mod. Air horn mod. EFI live with DP5. 4" MBRP no muffler with 5" tip. Glow shift EGT and Boost guages. Leveling kit. 285's. Just a low budget build to tow my trailers and have some fun at the same time.
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Old 03-03-2013, 08:35 PM
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I haven't checked my rates but I don't have smoke or haze my tires are good and I run about 70 psi filters were just changed
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Old 03-20-2013, 11:13 AM
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Do you still have your CAT on? It can be clogged and causing it not to run properly. How about air filter? I know these are some dumb questions, but a simple air filter change will help it run better..I personally know that. LOL
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Old 03-20-2013, 08:15 PM
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I've never noticed a cat under it and the air filter is new. The truck has 330 some thousand miles on it maybe its just to tired to get any miles might just be time for a Cummins swap
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Old 04-02-2013, 12:16 PM
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Originally Posted by Gnats on View Post
I've never noticed a cat under it and the air filter is new. The truck has 330 some thousand miles on it maybe its just to tired to get any miles might just be time for a Cummins swap
How new is your CP3? Check yoru fuel rail pressure on your CS / CTS monitor.
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