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Thread: I disabled AFM as an experiment.
08-26-2013, 01:22 PM #1
I disabled AFM as an experiment.
I used my Hypertech to disable AFM on my truck as an experiment. SO many folks are constantly talking about oil consumption, AFM makes for WORSE MPGs, etc., that I thought I would give it a try.
With AFM I get between 17.8-18.3 MPG Monday through Friday back and forth to work.
I disabled AFM last night and topped off the tank this morning for the drive.
I got 20.1 MPG driving to work, which is surprisingly slightly better than what I get with AFM on. Now I know weather, fuel blends, etc., have an impact on fuel economy as well, my driving back and forth to work at least takes the terrain out of the equation.
I will keep the forum posted.
At the very least, I don't have to hear the AFM turn on and off and hear it on my exhaust.
2013 Silverado LTZ White Diamond Crew Cab
Advent OGM1 Navigation
Husky Liners GearBox Underseat Storage
EGR Rail Caps
K&N Air Filter
Flowsound 40 Muffler
Hypertech Max Energy Tune (only top end limiter removed and AFM disabled)
Chrome Tailgate Handle Cover
TonnoPro HF-155 Tonneau Cover
WeatherTech Front and Rear Splash Guards
Husky Liners X-Act Contour Floor Liners
WeatherTech Side Window Deflectors
ChevyFan thanked for this post08-26-2013, 02:19 PM #2
So were we right?
2009 Chevrolet Silverado 1500 LT Z71 Crew Cab "All-Star Edition"
Line-X'd Custom Brush Guard(Heavy Duty)
5.3L Flex Fuel
275/65R18 Toyo Open Country AT2's
2" Rough Country Leveling Kit(want to get the 2.5 RC kit)
EGR In-Channel Vent Visors
Exterior PLUS Package
Interior PLUS Package
K&N Drop-In Air Filter
Cat-Back Dual Exhaust
Diablo Sport Predator(AFM Disabled)
Next Planned Mods
Blacked out Tail Lights
08-26-2013, 02:41 PM #3
08-26-2013, 03:38 PM #4
something to bear in mind is the fact that the ECM relearns things as you drive, so as you get more miles on it should only get better.
at least for me, the sweet spot if running 60-65 with the cruise on. flat ground the truck returns 23 on the instant econ display, and lots of interstate driving seems to support that.
2011 GMC Sierra SLE 5.3 Z71 4X4 Stealth Gray Metallic / 2004 Chevy Impala LS 3.8 Cappuccino
Tow mirrors - Diablew Tuned - Flowmaster Regular 40 - Ready Lift 2.5' lift - BFG LT A/T K/Os - Carr Light Wing - TruckLite LED lights - Optima Red Top - 50% Front Window Tint - Line-X bedliner - Airaid MIT - Tekonsha P2 - ARS Billet Grill - Fia custom fit seat covers
mfleetwood liked this post08-26-2013, 04:40 PM #5
The absolute best I ever got on my route to work for the week was 18.8MPG. Not bad for a heavy truck, but if it can do better with disabling AFM, then I'll do it.
08-26-2013, 04:46 PM #6
I cant wait to get my Diablo and see what kind of numbers my truck will get
08-26-2013, 06:09 PM #7
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You should chart it. Do a daily log and include the total miles, the MPG shown, weather conditions, etc.
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08-26-2013, 06:12 PM #8
For the most accurate results, go through several whole tanks with AFM off and then get back to us. Good luck with the experiment!Clint (TX) 2001 Silverado LS 4.8L auto 2wd ECSB [GARAGE]
Gasoline or gunpowder: If you ain't burning one, you ain't having fun!
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08-27-2013, 02:20 AM #9
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- Denver, CO
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Good thread topic...thanks for starting it!
Mike (Denver, CO) - 2008 Sierra 1500 Z71 SLE 5.3L 4WD
SUSPENSION: Rancho 4" Suspension Lift; Rancho RS9000XL Shocks; Rancho Skid Plates; Rancho MyRide Wireless Shock Controller;
TIRES: BFG All Terrain KO 315/70/17
DRIVE TRAIN: 4.56 Gears; Detroit TrueTrac Differential; True Cool 40k Transmission Cooler
PERFORMANCE: DiableSport Predator Tuner; Custom Tuned by Diablew; Magnaflow Exhaust; AFE Cold Air Intake
ELECTRONICS: Kenwood DNX6180 Touchscreen; Subthump box w/10" Kicker; Driver Information Center (DIC); Rear View Camera
ACCESSORIES: Westin Brush/Grill Gaurd; Westin Nerf Bars; Truxedo Tonneau; 20% Tint; Tow Mirrors w/Heat & Signals
08-27-2013, 11:46 AM #10
Update, day 2.
I arrived at work with the DIC reporting AVG MPG of 19.1. I will report back tomorrow.
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