Duramax Diesels Forum Truck of the Week
Old 01-10-2019, 04:17 PM
sfanello sfanello is offline
Join Date: Jul 2018
Location: Madison, WI
Posts: 1
Question 2011 LML Low MPG

Got a fairly stock 2011 LML, 87k miles, FASS 165 LP, S&B air intake, sinister intake bridge, and running 33's @ 70psi on a 2" front-end leveling kit. I commute daily to work which is a combination of town and highway. Changed my stock fuel filter and installed the FASS at 84k. NOT deleted. Currently only averaging 11.4 MPG (dic) and about the same on my Edge CST2. Seems to regen in spurts 1-2 times per fill up. Any thoughts, ideas or suggestions??? Thanks!
2011 Chevy 2500HD LT 4x4 LML
S&B Cold Air Intake
Sinister Intake Bridge w/ Resonator Delete
Fleece PCV Block Off w/ Reroute
FASS 165 Lift Pump
Beans Sump
Edge CTS Insight
3" Leveling Kit
285/75R17 Nitto Grappler G2's
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Old 01-10-2019, 04:35 PM
2004LB7's Avatar
2004LB7 2004LB7 is offline
Join Date: Dec 2010
Location: Norcal
Posts: 1,509


Run some tanks and hand calculate first then report back. The DIC can be way off

How many miles do you typically get on a full tank?
2008 Chevrolet 3500HD DRW LTZ
285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L.

2006 BRM Jetta TDI. Injectors, turbo, Malone custom tuning on ecm and tcm
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