MPG vs. Ratio
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
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From: Stephensville WI
It depends on the engine and the truck, plus the style of driving and any additional weight from towing or hauling.
There are situations where having a 4.10 or even 4.30 gear set will increase your fuel mileage a bit, but for the most part it won't hurt you badly.
There are situations where having a 4.10 or even 4.30 gear set will increase your fuel mileage a bit, but for the most part it won't hurt you badly.
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Senior User
Joined: Sep 2007
Posts: 431
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From: at Work
Originally Posted by redford
It depends on the engine and the truck, plus the style of driving and any additional weight from towing or hauling.
There are situations where having a 4.10 or even 4.30 gear set will increase your fuel mileage a bit, but for the most part it won't hurt you badly.
There are situations where having a 4.10 or even 4.30 gear set will increase your fuel mileage a bit, but for the most part it won't hurt you badly.
Post Fiend
Joined: Sep 2006
Posts: 6,634
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From: bricktown NJ
Originally Posted by fordfish
08 6.4 350Dually, for the most part- daily driver, weekend camping and boat towing. camper is a 5er about 11K, boat is pontoon 6K.
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Senior User
Joined: Sep 2007
Posts: 431
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From: at Work
Originally Posted by 350steve
Do you have this truck now 350 drw?
I have a 01 D-max now with 373, gets abou 16.75 hwy empty, 14-15 city.
pullin my 5er- 8-9 at 75ish mph.
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Senior User
Joined: Sep 2007
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From: at Work
Originally Posted by rbaker6336
normally 2 to 4 mpg better empty with 3.73 over 4.10
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Post Fiend
Joined: Feb 2007
Posts: 7,191
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From: Blairsville,Ga
Originally Posted by fordfish
2-4 yikes! that's 25-30 % less than what I've been told is the norm (14) mpg.
my 7.3 with 4.10s gets about the same as your chev a little better towing at 9+
towing 10k at 85+
7.3 with 3.73s some get 20+ empty interstate
I get 18 mixed if I stay at or below 2000 rpm bout 14.5 city
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Post Fiend
Joined: Sep 2006
Posts: 6,634
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From: bricktown NJ
Originally Posted by fordfish
no, stealer is locating one now. 4.10's everywhere, 3.73 hardly out there.
I have a 01 D-max now with 373, gets abou 16.75 hwy empty, 14-15 city.
pullin my 5er- 8-9 at 75ish mph.
I have a 01 D-max now with 373, gets abou 16.75 hwy empty, 14-15 city.
pullin my 5er- 8-9 at 75ish mph.
forums in the diesel section.The 350 drw is a beast i have the 6.0 drw...
welcome to the site.
Last edited by 350steve; Sep 25, 2007 at 12:51 PM.
Elder User
Joined: Dec 2006
Posts: 594
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From: New Jersey
There is a pretty good article in this months Trailer Life magazine that did a comparison using a Ford PSD, Dodge Cummins and a Jeep gasser. It gave a real good explanation as to the effects of speed, weight, the engines torque curve, etc. and there effects on mileage. There are alot of factors in play other than just gearing. I agree with the statements though that you will probably see a real world difference of about 2 to 3 mpg between the 3.73 and 4.10's if driven identically.
Elder User
Joined: May 2007
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From: Carlos, MN
Originally Posted by johnnysF350
There is a pretty good article in this months Trailer Life magazine that did a comparison using a Ford PSD, Dodge Cummins and a Jeep gasser. It gave a real good explanation as to the effects of speed, weight, the engines torque curve, etc. and there effects on mileage. There are alot of factors in play other than just gearing. I agree with the statements though that you will probably see a real world difference of about 2 to 3 mpg between the 3.73 and 4.10's if driven identically.