Highway fuel economy running looney - Ford Powerstroke Diesel Forum

6.0L Performance Parts Discussion What has or has not worked for you?

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post #1 of 24 Old 10-25-2007, 08:18 PM Thread Starter
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Highway fuel economy running looney

Has anyone noticed DJ's looney doesn't get nearly as good fuel economy as street or economy at higher speeds? It's not really a big deal, but I've read about everyone getting the best economy on the hot tunes, so I thought I'd try it for a couple days. I've been getting in the 18s on the highway running street and economy. The best I can do looney is 15.1 at 75 MPH. Last night I ran looney on the way over on a 30 miles trip. I ran street on the way back to compare. I got 15 running looney. I got almost 19 on the way back running street.

Is this normal on looney?


2006 F-250 Powerstroke Crew Cab Lariat Long Bed 4x4 FX4

SCT Xcal2 with Xtreme tunes by Innovative

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post #2 of 24 Old 10-25-2007, 08:30 PM
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I've noticed that the street file does a little better than the Looney on long highway runs. I'd have to do a really long highway run with both (Back to back) to be able to hand-calculate the difference. Oddly, the best file I've used for fuel economy is the Xtreme race by Innovative (I think it has more to do with TCC management than anything else).
I'm seeing (So far...mixed driving)
-Looney 16.2-16.4
-street 16.3-16.6
-xtreme street 16.4-16.5
-xtreme race 16.7-17.0

This is just the mileage ranges I'm seeing... not much difference to be honest. Stock, I was getting about 15.5 (Give or take a little)

Tad Wiltman
'04 F-350 CC, SRW, Long bed
3.5" lift 35X12.5 18 Toyo Open country M/T
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post #3 of 24 Old 10-26-2007, 02:41 AM
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Originally Posted by TLWiltman View Post
I've noticed that the street file does a little better than the Looney on long highway runs. I'd have to do a really long highway run with both (Back to back) to be able to hand-calculate the difference. Oddly, the best file I've used for fuel economy is the Xtreme race by Innovative (I think it has more to do with TCC management than anything else).
I'm seeing (So far...mixed driving)
-Looney 16.2-16.4
-street 16.3-16.6
-xtreme street 16.4-16.5
-xtreme race 16.7-17.0

This is just the mileage ranges I'm seeing... not much difference to be honest. Stock, I was getting about 15.5 (Give or take a little)
VERY interresting. I'm trying Eric's Xtreme Street right now hoping for some better economy but it's so damn sick on the low end I can't help but racing everyone around me. I can hardly give it any pedal without breaking the tires loose. Higher end seems alright but any gains I'm seeing I'm tossing right back out the window by my bad driving habits.
So I guess without running an Economy tune from one of the big tuners seeing 20 just isn't going to happen?

'05 F250, CC, FX4, 6.0 PSD
sct x4
MTW Stage 1 Turbo
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Big azz dent from a blown tire.


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post #4 of 24 Old 10-26-2007, 02:44 AM
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i have no idea on what i am getting. i think cause of the lift, and big tires my mileage is gonna be crap anyway......


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post #5 of 24 Old 10-26-2007, 04:29 AM
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This thread really interests me because I want the best economy on the hwy possible. Around town is out the window because I won't be able to keep my foot out of it unless it's a lame tune

05 F-250 6.0 Lariat, FX4, 4x4 Crew Cab, Torqshift, 3.73, Power Sun/Moon Roof, SS 4in Magnaflow Turbo Back w/cat delete, Zoodad, EGR delete w/FCPD UP pipe, SCT Xcal 3, HID Light Kit, 5w-40 Rotella T6, Century Fiberglass Cap
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post #6 of 24 Old 10-26-2007, 04:34 AM
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Yeah I want to see everyones take on this thread too. I spend a lot of time on the road this time of year and I want the best economy I can get but I refuse to run stock. I've been hesitant to try one of the custom tuners Economy tunes because I was afraid it wouldn't have the get up go over stock that I want when I need it.

'05 F250, CC, FX4, 6.0 PSD
sct x4
MTW Stage 1 Turbo
DJ's FUEL+ - Fuel Pressure Intensifier
Nitrous Express NXd Stacker
Snow Performance Stage III Water/Meth Kit
ARP Studs
MBRP 4" Turbo Back w/ no Muffler & no Cat
DashBoss on my iPad
ISSPRO Gauges in Triple A-Pillar
High Idle Mod
Iron Horse Front Bumper Replacement
12,000LB MileMarker Winch
2000Watt Power Inverter
Viper 5901 Remote Start/Alarm
Pioneer Avic-D3 Stereo/Nav
Train Horns!
Valentine 1
Velvet ride shackles
RockStars on 33's
Big azz dent from a blown tire.


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post #7 of 24 Old 10-26-2007, 04:39 AM
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I have been running stock and I just got an xcal 2. I have been debating on which tunes to get and from who in order to get the best mileage vs power. I have been getting pretty crappy mileage around town (12.5 - 13.5) and highway I have been getting about 18. I would like to get around 16 - 18 in the city with a good bit of power to "race" people if needed but I would also like to at least get the same mileage I have been getting on the highway. Suggestions??
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post #8 of 24 Old 10-26-2007, 05:03 AM
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Don't let your truck idle! Every hour of idle time equals at least a 1 mpg drop in fuel economy. If it takes you two weeks to burn a tank of fuel and you let the truck warm up for an extra 5 minutes every day, that adds up to your one hour of idling per tank. The only way to achieve maximum fuel economy is to make sure that when the fuel is burning the wheels are turning!

Different tunes are going to show different results for each individual and their driving habits. I can get better mpg from my Xtreme Street tune, but on average I get the same as stock because of the tendency to "use" the extra power. The aggressive tow tune seems to be about the best for my stop and go daily driving style. It lessens the urge to shred the tires and burn extra fuel.
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post #9 of 24 Old 10-26-2007, 05:23 AM
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I read where people say they're getting 20 all the time. I'm curious as to what they're running on.

'05 F250, CC, FX4, 6.0 PSD
sct x4
MTW Stage 1 Turbo
DJ's FUEL+ - Fuel Pressure Intensifier
Nitrous Express NXd Stacker
Snow Performance Stage III Water/Meth Kit
ARP Studs
MBRP 4" Turbo Back w/ no Muffler & no Cat
DashBoss on my iPad
ISSPRO Gauges in Triple A-Pillar
High Idle Mod
Iron Horse Front Bumper Replacement
12,000LB MileMarker Winch
2000Watt Power Inverter
Viper 5901 Remote Start/Alarm
Pioneer Avic-D3 Stereo/Nav
Train Horns!
Valentine 1
Velvet ride shackles
RockStars on 33's
Big azz dent from a blown tire.


"It is foolish and wrong to mourn the men who died. Rather we should thank God that such men lived."
- General George S. Patton, Jr

Please support our troops!

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post #10 of 24 Old 10-26-2007, 05:28 AM
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ive noticed the street files get better mpg also...i think its because the race file doesnt take as much slowing down and such running down the road and it speeds up faster than normal using fuel it doesnt necessarily have to...

2003 Centennial Black Lariat F250, SRW, CC, SB, 4x4
SCT by IDP, Airraid intake w/zoodad, Intake elbow, 5" straight pipe w/6" MBRP tip, Powershot2000 propane injection, PI t/c, Suncoast tranny, billit input, Quad commander, 2-10" kicker subs in custom box, sirius sat. radio, pioneer avic D3 deck, level kit, 33X12 Courser c/ts
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Best times to date: 8.36 1/8 mile, 1.73 60'
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