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post #1 of 9 Old 07-25-2013, 08:44 AM Thread Starter
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6.7 MPG

I have a 2014 F-250 4x4 6.7 on order. I ordered it with 3:31 final ratio. I was surprised to see this ratio offered, 3:55 is the highest I've seen in past years. I see a lot of posts regarding fuel economy, but not much mention of gear ratios. Anybody know what kind of mileage to expect compared to 3:55? I will be towing my boat on weekends, and my 63 VW Panel van to shows occasionally. I use my F-450 for heavy hauling. I'm a newbie here so go easy on me.
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post #2 of 9 Old 07-25-2013, 10:43 AM
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3.55's usually come with 20" wheels, while the 3.31's come with 18" wheels (max). The result is the final ratio is about the same, so there doesn't seem to be a significant difference in milage between the two ratios for most stock configurations.

2013 F-250 Diesel 4X4 Lariat Crew Cab SRW Short Bed FX-4 with 3.31 rear
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post #3 of 9 Old 07-25-2013, 11:39 AM
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My 2012 F-350 came with 3.55 gears and 18" wheels. I average approx 17.5 combined city and highway and have seen as high as 21.7 on the interstate. Mine are a bit higher than stock from installing a Bank's Automind tuner.


2012 F-350 Crew Cab Lariat 4X4
H&S XRT Pro; DPF deleted; S&B Air Intake

2006 F-350 Crew Cab XLT 4X4 *SOLD*
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post #4 of 9 Old 07-25-2013, 12:19 PM
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2013 Lariat Eco-Boost F150 Super Crew 4x4 5K Miles. Max-Tow 3.73's, luxury package


(Sold) 2011 Lariat 6.7 F350 CCLB SRW 4X4 60K MILES
Nitto Terra Grappler 295/70/R18 on OEM's
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post #5 of 9 Old 07-25-2013, 12:36 PM
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13-15 here. 3.55. 20s and 35s.
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post #6 of 9 Old 07-25-2013, 12:58 PM
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I am getting ~19 mpg driving back and forth to work right now (more highway than city) - I have a 3.31 rear end and 20" wheels.


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2011 F250 KR FX4 4x4 CC SB
2006 F250 XLT FX4 4x4 CC SB, EGR Cooler Delete, AutoMeter Gauges, Scangauge II, SCT x3 Custom Tunes - SOLD!
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post #7 of 9 Old 07-25-2013, 02:23 PM
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Larry
2015 F-350 CCLB DRW, Lariat Ultimate,
2nd Gen. 6.7L "Scorpion" Turbo Diesel,
440HP/860TQ, Torque Shift 6-speed,
Tuxedo Black W/Charcoal Black Int.,
14,000 LB GVWR,
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17" Polished Forge Alum. Wheels,
BFG All-Terrain Tires,
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post #8 of 9 Old 07-25-2013, 04:11 PM
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had a 2012 f250 with 20" wheels 33" tires 3.55s 17 mpg. Have a 2013 f250 now 3.31s with 20" 33" 18-20 mpg. Here in flat florida.

13 F250 Lariat CC SB 3.31 EL axle w/SPE full lock module, Ultimate Interior,
H&S Big Single 64mm NON VGT Turbo Kit, Cast manifolds, NON Cobra downpipe, Mini MAxx w/H&S stock fuel tune
Down Pipe back 304T 4" Diamond Eye, AFE stage II intake, front 4 link,
Road Armor bumpers front/rear. N Fab nerf steps. 20" American Force w/Trxus 33",
Dura flaps, Air Lift rear bags, 34k+ miles, Stage 3 traction block bars.


2012 F250 TOTALED.

Civilian Contractor Airforce 2+ years Asscrackistan.
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post #9 of 9 Old 07-25-2013, 04:17 PM
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Ive got the 3.31 with 18's and 37's, avg 14 city and 17 highway through the lie-o-meter...

2013 F250 6.7 ccsb,Carli Pintop 4.5, FUEL Offroad Octane Rims, Toyo MT's 37, Smittybilt light Bar, Rigid D2's, Rigid 20" LED

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