Minimaxx on and mileage still sucks..help - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 09-13-2010, 03:08 PM Thread Starter
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Minimaxx on and mileage still sucks..help

So I've hard my Minimaxx tuner for about 2 months now, and I am not seeing any better gas mileage outta my truck than I was with the the dpf on it, and I have been trying my *** off to get this thing to get some better mileage.
So I have the Minimaxx with the Hot Damn Tunes, run it on the hot setting, S&B intake, and doc/dpf delete on stock exhaust, fresh oil, and fuel filters.

I have noticed that if I flatten the pedal at about 40-50 and put a heavy load on the motor it will give me the low rail pressure every time. I have also seen to much fluctuation in fuel pressure code once while launching hard to do the tranny relearn, and I have noticed that if I get into the high boost, 40psi +, I'll see restriction on the intake restriction meter. Also the truck might be losing some coolant, but I can't tell for sure yet, any good way to check my heads??
I was seeing between 12-14 mpg before the dpf delete, and now even though the lie o meter says 22mpg hand calc is about 11-13.

Help me out any idea at what to look at or what might be going on??
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post #2 of 8 Old 09-13-2010, 04:19 PM
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How do you drive? Always gunning it?

2008 F250 FX4
H&S Black Maxx
S&B CAI
"Stock" Exhaust....in the shed
Recon Lights here and there

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post #3 of 8 Old 09-13-2010, 04:22 PM
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is everything else on the truck stock? no 8 " lift 37" mudders?
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post #4 of 8 Old 09-13-2010, 04:38 PM Thread Starter
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nope nothing crazy, stock height offroad package xlt, hell the tires are the bfg commercial highway tires. As far as driving I have been really really careful the last 3 tanks keep it under 1/4 throttle, keeping the boost down, not idling for long, blah blah all that gas saving junk, and still no improvement. Oh I don't seem to be losing any coolant after checking today so I'm pretty sure the motor is most likely intact as all the gauges look good, and the fluids look good
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post #5 of 8 Old 09-13-2010, 04:47 PM
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No idea. I run the "hot damn" tune and am getting about 18 MPG. I would give H&S a call and see if they have any ideas. I know when I first got it, I wasn't getting much better. I found the cause of that being my right foot.

2008 F250 FX4
H&S Black Maxx
S&B CAI
"Stock" Exhaust....in the shed
Recon Lights here and there

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post #6 of 8 Old 09-13-2010, 07:37 PM
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Yea i noticed the same thing on my Mini Maxx , I downloaded the hot damn tunes . Now i have only checed the milage on the lowest setting 80hp and my truck got 15 mpg on it , i am currently working on the 175 tune to check milage.

08 F250 Ext. Cab long bed 4x4 Lariet , H&S Mini Maxx , 4" S/S Flow Pro Downpipe ,5" Flow Pro S/S Exhaust ,AFE si Intake , Pro Comp Traction Bars . Kem Mini Maxx 75 through 345 tuning .
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post #7 of 8 Old 09-13-2010, 07:41 PM
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Oh and the lie-o-metor says 23mpg

08 F250 Ext. Cab long bed 4x4 Lariet , H&S Mini Maxx , 4" S/S Flow Pro Downpipe ,5" Flow Pro S/S Exhaust ,AFE si Intake , Pro Comp Traction Bars . Kem Mini Maxx 75 through 345 tuning .
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post #8 of 8 Old 09-13-2010, 08:11 PM
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I find it weird how everyone's meter on the dash is off so much. Mine reads to the low side on my stock 08 job1 work truck. meter says 12.2 . I drove it 600 miles the other day and hand calculated it at 13.9avg.

My tuned truck says 16-18 on the dash and averages a hand calculated between 18-20 on the highway. But when it was stock the first 1000 miles it averaged 15.8 hand calculated and said it was getting 13 on the lie o meter.. I think a lot of it has to do with how you drive. To little throttle it will suck fuel, to much and it will suck there is a happy medium.

On the job1 trucks i have noticed while in city traffic w/ mixed hwy it you use the tow hual button it seems to increase mileage a lot.

2010 Ford F250 CCSB Afe stage 2 si, Spartan 300,310,350 tunes, 5" flow pro down pipe back straight pipe,powerstroke67 ceramacoated downpipe, powerstroke67 Cold side pipe, Afe intercooler, Turbo socks, and a lot more to come.
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