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Any mpg differences with AFM off?

Chad2815

By Chad2815
in Modifications & Accessories

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Chad2815 Enthusiast

Chad2815

Posted
Posted

I have a 14 Silverado with the 6.2 and still working on getting the tune dialed in. Right now I have AFM off but Im on post with the Army so I am not driving much, just curious of anyone else with the 6.2 has noticed a difference? I also have the max tow with 3:73 gears so I know driving around town I could stay in V4 quite a bit. Thanks for the help!

Coach Hill Enthusiast

Coach Hill

Posted
Posted

I had mine turned off long ago. I think it makes no difference to be honest. I'm sure there are those that will disagree with me, but I'm still getting around 20 mpg on long highway trips so I will never have it enabled again. The lifetime MPG on my truck is around 16.5 so I'm good with that. My old truck with the 5.3 never got that kind of MPG.

 

I'm also not sold on the technology of the AFM with all the oil consumption issues of the past which was the initial reason I had mine disabled. My truck has the 3:42 gears so that is surely a factor compared to what you have but I'd leave it tuned out and not worry about it!

Chad2815 Enthusiast

Chad2815

Posted
  • Author
Posted

Yeah I am leaning towards that. I did have an 07 Avalanche that I left AFM on with and it never had any oli consumption issues after 212,000 but it could have been the Mobil 1? Thanks for the feedback, 16.5 is right where I was before the tune so thats encouraging.

fondupot Senior Enthusiast

fondupot

Posted
Posted

No substantial difference in MPG with AFM off and AFM on. I've tried both with my Blackbear tune.

FishinJ Enthusiast

FishinJ

Posted
Posted

My thought is that is has a lot to due with where you are and what kind of driving you do. I'm in FL and have a very flat drive (few bridges) to and from my office with about a 10 mile stretch of 34 - 50 mph zones that I put on cruise. With the tranny in D and AFM will kick in for most of the drive and the mpg's go up quite a bit. If I do the same drive with the tranny in the M they are up but 3-5 mpg's below what the AFM readings are. With the AFM on any inclines switch it to V8 mode, so I think if you live in anywhere with hills or traffic AFM probably isn't doing much if any gains in mpg's. Also, when you going 70+ on the highway it's not staying in V4 much either.

 

Where I think it would save some gas would be flat back county roads cruising 50-55 for long periods. I did a 10 mile appox drive with a 25+ mph wind at my back last week and it was reading 32-34 mpg but at then end of the day I came right back at it so it averages all out.

amxguy1970 Senior Enthusiast

amxguy1970

Posted
Posted

FishinJ is pretty much spot on. Yes it will save fuel, how much is up to you and other factors. Notice they all said didn't make much of a difference. So depending on what you had to average the V4 against matters. Lots of idling, high speeds, stop and go, ect. But going from 21 mpg to 21.75 isn't really much to some but it adds up, it can be more depending on the area. Either way you slice it, any time it is in V4 it is using half the fuel, period...

 

Tyler

shockedimpy Enthusiast

shockedimpy

Posted
Posted

Does Diablo I-TUNE offer the AFM to be turned off? Im noticing some serious clunky transmission situations at low speeds. Between it shifting around like crazy and consistently jumping from V8 to V4 Im hoping a tune will make this more smoother.

Chad2815 Enthusiast

Chad2815

Posted
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Posted

Yeah I like it. Pretty simple to use with the canned tunes and if you want to go the custom route just google diablew, he does some pretty good stuff on the custom side. I got mine on rpthe pepboys website for 35 percent off so I sold my Autocal box and it paid for the diablo intune and the cistom tune through diablew.

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