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Old 01-30-2014, 06:23 AM
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H&S tuner mileage question

I have a 2009 6.4 crew cab short bed pickup. At stock I was getting 10.5 mpg in town. In efforts for better mpg I have deleted the dpf (not the cat) I have installed a s&b stage 2 intake and a H&S mini maxx. Running on hot damn 300 tune and driving like a grandpa. After all this I am now getting 11.2 mpg in town and 14mpg hwy. pretty pathetic for all that work. Truck drives absolutely great. It does have oversized tires but had that before the tune and other mods. Any thoughts on what else I could try? Thanks!


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Old 01-30-2014, 07:17 AM
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I have pretty much the same set up as you. Just bigger exhaust. I am getting about the same mileage as you, but I am not driving like a grandpa though. I really don't know what else we can do to improve mileage short of upgrading to a manual six speed, or maybe the new truck's six speed.
Gear vendors overdrive on stock power maybe, but with our setups no way. Too much torque (unless they would guarantee it ).
I hand calculate my mileage so I know its not really improving even though the dash claims it is. But I am still happy with the upgrades.
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Old 01-30-2014, 08:23 AM
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I get around 16 overall... 15.5 city, and sniff 20 on long highway runs.. I should update my fully to show details..

Here is the thing about tuning, fwiw:

If you tune a healthy rig, you can graph and expect gains within that tunes range.. if the engine and drivetrain aren't healthy, you can toss graphed expectations out the window... Tuning pushes the envelope further than oe parameters, and while doing so often exposes issues already existing that you might not have previously known about...

You should be getting better mileage than that, so, no matter how the truck runs, something is amiss.. you said it improved slightly with tuning, but not a lot.. so.. The tuning didn't expose anything.. which means its likely a hard part instead of fuel delivery..

I like puzzles.. I'll have to think on this..
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Old 01-30-2014, 08:28 AM
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Thanks for your time thinking on it guys. I actually have done this to both of my trucks. Both 09 models and identical in mileage etc... Both trucks have run seemingly perfect with no issues before and after tuning. Just seems like at least one of the trucks would have jumped up higher in Mpg's. I have been told to take the cat off also. Didn't really want to do that because I didn't want it to be so loud. Also some have said I need bigger exhaust. Happy to do both of those if it really is going to help. Just tired of throwing money out if anyone can think of anything else. Thanks again guys for your help.


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Old 01-30-2014, 08:46 AM
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What are your EGTs at highway speed and steady pace?
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Old 01-30-2014, 09:01 AM
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This is the reason I have always recommended deleting for reliability and power, and accept any fuel mileage gains that may or may not come with it.
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Old 01-30-2014, 09:02 AM
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Getting ready to do the same setup, Mini Maxx, H&S, MBRP Intercooler 3" pipe and full delete(cat and dpf) to try and get better fuel mileage and reliability so I will be keeping an eye on this thread!
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Old 01-30-2014, 09:30 AM
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At the risk of sounding stupid. How do I find the egt's on my mini maxx? I don't see "egt" anywhere.


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Old 01-30-2014, 10:04 AM
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I think its pyro one..
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Old 01-30-2014, 10:05 AM
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Excellent. I will look at this here in a bit or this evening and report back. Thanks man


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