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Old 02-14-2013, 07:27 PM   #1
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2:73 VS 3:31

So here's the situation. I want awesome MPG for my 13' V6 (hopefully average 25+ if not more. I have a light foot), but I also want to get this car in the low 5's for 0-60 (tune, CAI, maybe a little more) but I've heard the 2:73 gears are pathetic? Are they really that bad? I've heard 3:55 are good, but I think I lose too much mileage going that high of a ratio. The Performance Package offers the 3:31 though!

Question 1- What's the difference you guys see or know of in 2:73 VS 3:31 MPG wise?

Question 2- What's the difference you guys see or know of in 2:73 VS 3:31 regarding 0-60 times?

Long story short- I want awesome MPG's when I'm just driving around (I do probably more city then highway, but it's more open city driving with stop lights every now and then), but at the same time when I want to have fun I want my pony to get me moving quickly!
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Old 02-14-2013, 07:52 PM   #2
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If you are going to change gears id say 3.55, 3.23 are not the best with 3.55 youll get a good mpg on highway if you dont speed too much and might actually see an increase in the city from what ived heard from others.
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Old 02-14-2013, 07:54 PM   #3
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3.55s are the best all around gear.
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Old 02-14-2013, 08:26 PM   #4
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Originally Posted by tgmeyer View Post
So here's the situation. I want awesome MPG for my 13' V6 (hopefully average 25+ if not more. I have a light foot), but I also want to get this car in the low 5's for 0-60 (tune, CAI, maybe a little more) but I've heard the 2:73 gears are pathetic? Are they really that bad? I've heard 3:55 are good, but I think I lose too much mileage going that high of a ratio. The Performance Package offers the 3:31 though!

Question 1- What's the difference you guys see or know of in 2:73 VS 3:31 MPG wise?

Question 2- What's the difference you guys see or know of in 2:73 VS 3:31 regarding 0-60 times?

Long story short- I want awesome MPG's when I'm just driving around (I do probably more city then highway, but it's more open city driving with stop lights every now and then), but at the same time when I want to have fun I want my pony to get me moving quickly!
Based upon your wants to get 25 plus miles per gallon and rocket 0-60 in approximately the low 5 second range, you should get 3:55 or 3:31 gears. I currently have the 2:73 gears and they are weak down low when punching it at a dead stop. I hear having the 3:31 gears are a big difference over the 2:73 when it comes to its acceleration, however I don't know how much less mpg with 3:31 gears compared to 2:73 gears. It also depends how you will drive your car. I was getting around 29 MPG highway and non highway prior to my performance tuner. Post tuner, I'm now getting around 26 MPG and with 2.73 gears because the car is so much fun to drive. I can't keep my foot light. That's the darn problem with our new V6's they are so much fun to drive. They have such good power stock, then throw in a set of 3:55 or 3:73 gears, performance tuner, CAI and the V6 is a mini beast. Its hard to get great MPG when you want to drive it like you stole it. Lol. I love hearing the engine and exhaust roar when full open throttle. The sound is intoxicating, at least to me it is.

I personally wouldn't go any lower than 3:55 and now leaning towards 3:73 gears which may be perfect for non track, street use. I only go around 8k miles per year so Max MPG's are not a concern of mine. For your wants I would go with 3:55 for your situation. I think you will be able to achieve the 25 MPG you want and the 0-60 times.
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Old 02-14-2013, 09:18 PM   #5
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have 3.31 as stock, all part of the perf package. drove both before ordering. the 3.31 takes off better and still gives me 25-27 around town minus the a/c. only use that when its bloody raining here at the beach
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Old 02-14-2013, 09:24 PM   #6
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I've read that there's not much difference in mpg between 3.55-3.73. I plan on jumping from 2.73 to 3.73 very shortly!
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Old 02-14-2013, 09:42 PM   #7
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I've read that there's not much difference in mpg between 3.55-3.73. I plan on jumping from 2.73 to 3.73 very shortly!
That will be a jump lol.
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Old 02-14-2013, 09:43 PM   #8
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I've read that there's not much difference in mpg between 3.55-3.73. I plan on jumping from 2.73 to 3.73 very shortly!
Me too bro. I'm gonna pull the trigger on 3:73 gears.
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Old 02-14-2013, 11:23 PM   #9
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Getting my 3.73's installed on Monday. From what I understand the mpg isn't going to hurt that bad. I figured may as well get what I really want instead of settling for something less.
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Old 02-14-2013, 11:32 PM   #10
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The mpg is really all in your foot, if you can control your foot and don't mind driving a little slower on the highway you can see good mpg
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Old 02-15-2013, 05:59 AM   #11
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have 3.31 as stock, all part of the perf package. drove both before ordering. the 3.31 takes off better and still gives me 25-27 around town minus the a/c. only use that when its bloody raining here at the beach
X2. I have the same setup in gearing (3:31), and the mileage with them gets me an honest 27 to 28 on the highway if I keep it set at 75 MPH or below (right at the 2K RPM range). The response is very snappy when I get on it. Plenty good for my requirements. I drive an average of 600 to 700 miles a week, so MPG is a first thought. The 3:31 are a good all around choice for my driving requirements. I'll guess that's why Ford offers so many rear gear choices.
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Old 02-15-2013, 01:07 PM   #12
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X2. I have the same setup in gearing (3:31), and the mileage with them gets me an honest 27 to 28 on the highway if I keep it set at 75 MPH or below (right at the 2K RPM range). The response is very snappy when I get on it. Plenty good for my requirements. I drive an average of 600 to 700 miles a week, so MPG is a first thought. The 3:31 are a good all around choice for my driving requirements. I'll guess that's why Ford offers so many rear gear choices.
Are you stock beyond that? Or do you have any CAI or tune?
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Old 02-15-2013, 04:49 PM   #13
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I'd personally go with the 3.55. It's not a full on race car, yet its not the wimps of 2.73's. I have the 2.73. They are alright. I pre load if I want to have fun. But just punching from idle, well it just sucks. I average 29-30 at 75 mph. Also like my v6 for the power and fuel efficiently.
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Old 02-15-2013, 05:00 PM   #14
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I'm debating 3.73 or 3.55s. Was going to go 3.73 but not sure now.
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Old 02-15-2013, 06:55 PM   #15
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Like stated earlier, 3.55 is a well rounded gear. I'ma mid range person anyway. Not too flashy, yet not the base. Thus my premium package
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Old 02-15-2013, 07:12 PM   #16
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Door jam sticker decoded

Look on your door jam at the sticker. Look at what axle code you have and then see which letters are on this decoder. Now you have your factory axle ratio,

2011 & 2012


The axle ratios are:
BB - 3.73 ratio, base vehicle with manual or automatic transmission
CC - 2.73 ratio
DD - 3.55 ratio with manual transmission
GG - 3.31 ratio with automatic transmission
YY - 3.15 ratio

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Old 03-05-2013, 09:45 AM   #17
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Just to bring this back to life. What are the 3.31 guys pulling rpm wise at 75? I have 2.73 but love my mpg. I have enough top end but want the mpg of the 2.73. I pull 1,700 at 75 with cruise. I'm adding an intake and tune, and when they finally develop them, shorty headers and an axle back. I'm in an auto so will I feel anything?

Also, do you 3.31 guys have any weird acceleration as to the subjective 2.73's having a stalling feeling?
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Old 03-05-2013, 10:25 AM   #18
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@ 75 mph with 3:31 im right around 1,900 rpm.
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Old 03-05-2013, 10:55 AM   #19
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yep..., close to same rpm range when in 6th
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Old 03-05-2013, 12:27 PM   #20
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I am going to have to check, but it seems to me between 2000 and 2100 at 75 with my 3.31's and Manual trans.
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Old 03-05-2013, 12:28 PM   #21
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I feel you I don't know what gear to pick neither 3:31,3:55,3:73
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Old 03-05-2013, 12:32 PM   #22
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If I had the 2.73 gears I might have gone to 3.55's, but I did get the performance package so I got the 3.31's stock. I do about 500 miles a week so to me the 3.31's are great.
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Old 03-05-2013, 12:44 PM   #23
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But how is the acceleration? I'm not interested in a rocket just yet. Ill let the tuner and headers deal with that
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Old 03-05-2013, 12:50 PM   #24
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But how is the acceleration? I'm not interested in a rocket just yet. Ill let the tuner and headers deal with that
0-60 5.7 seconds with my winter tires and Bama tunes, almost 82 MPH in the 1/8th mile, once again with the winter tires on.
I wish it would warm back up
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Old 03-05-2013, 12:50 PM   #25
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I am going to have to check, but it seems to me between 2000 and 2100 at 75 with my 3.31's and Manual trans.
Same here
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Old 03-05-2013, 02:41 PM   #26
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I am going to have to check, but it seems to me between 2000 and 2100 at 75 with my 3.31's and Manual trans.
This is accurate. I have 3.31 and a manual trans. At 100 mph it's still under 3k. I saw an rpm chart somewhere. I think it was on AMs gear pages.
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Old 03-05-2013, 06:20 PM   #27
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I just want the good acceleration yet my mpg. Oh yeah, I've heard round here that gears above 3:31 makes the odometer count miles wrong
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Old 03-05-2013, 07:46 PM   #28
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I just want the good acceleration yet my mpg. Oh yeah, I've heard round here that gears above 3:31 makes the odometer count miles wrong
Not if you get it tuned properly
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Old 03-05-2013, 07:52 PM   #29
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I'm at about 2k to 2.2k at 75.
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Old 03-05-2013, 08:08 PM   #30
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I just want the good acceleration yet my mpg. Oh yeah, I've heard round here that gears above 3:31 makes the odometer count miles wrong
This is one of the many reasons that I'm having a hard time doing any power train or engine mod with out a tune. (Gears, CAI, etc.)
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Old 03-05-2013, 09:18 PM   #31
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This is one of the many reasons that I'm having a hard time doing any power train or engine mod with out a tune. (Gears, CAI, etc.)
Headers... Tune.... Intake I want.... Tune.... Gears.... Tune. Axle backs.... What the hell, tune... Tune I want.... Tune.

Least I can get 3.31 re calibrated and still have a stock tune for now.
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Old 03-06-2013, 04:36 AM   #32
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Headers... Tune.... Intake I want.... Tune.... Gears.... Tune. Axle backs.... What the hell, tune... Tune I want.... Tune.

Least I can get 3.31 re calibrated and still have a stock tune for now.
Yea if you have 2.73 like I do and want a little more low end torque plus no tune go with the 3.31. Ford can install and recalibrate w/o losing your warrant.
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Old 03-06-2013, 05:27 AM   #33
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have 3.31 as stock, all part of the perf package. drove both before ordering. the 3.31 takes off better and still gives me 25-27 around town minus the a/c. only use that when its bloody raining here at the beach
X2

There's a reason Ford offered the 3:31 as their performance package gearing; best MPG and accelleration. Sure, the 3:55 is a taller gearing for quicker starts, but IMO, the 3:31 is the best all around for MPG and accelleration combined.
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Old 03-06-2013, 05:33 AM   #34
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X2

There's a reason Ford offered the 3:31 as their performance package gearing; best MPG and accelleration. Sure, the 3:55 is a taller gearing for quicker starts, but IMO, the 3:31 is the best all around for MPG and accelleration combined.
What mpg's you getting on highway driving and 3:31 gears bro
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Old 03-06-2013, 05:37 AM   #35
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What mpg's you getting on highway driving and 3:31 gears bro
I drive from Orlando to Tampa at least three times a week, and with the cruise set to 75 (right at 2K RPM's), I get 27.2 average.

In the city stop and go, I average 23.4

I buy V6' for this reason (fuel economy), and by far this 3.7 V6 is the best performer to date.
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