3.73 or 4.10?
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3.73 or 4.10?
Can anyone tell me about how the the mpg difference is between the 3.73 & the 4.10. I plan on picking up my new psd tomorrow afternoon. It is a crew cab dually with the 4.10. I know I will like it pulling a load over the mountains but was wondering what it would cost me in mpg difference in the daily driving without a load. This is my first post, feel fortunate to have found such a great site. Thanks in advance!
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From: Melbourne, Aus
thompson50,
Welcome to FTE.
Check out our Guidelines:
https://www.ford-trucks.com/guidelines.html
And the Read First: notices at the top of each forum, it will help you understand and navigate FTE easier.
As for a mileage difference over a set 0f 3.73's, it will be very minor - and only evident on high speed empty cruising.
At all other times - towing, town driving, the 4.10's shouldl get better mileage.
BigF350
Welcome to FTE.
Check out our Guidelines:
https://www.ford-trucks.com/guidelines.html
And the Read First: notices at the top of each forum, it will help you understand and navigate FTE easier.
As for a mileage difference over a set 0f 3.73's, it will be very minor - and only evident on high speed empty cruising.
At all other times - towing, town driving, the 4.10's shouldl get better mileage.
BigF350
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From: Dark side of the moon
Twice a year I go to Arkansas for a bike ride with a friend. Once I drive my '05 psd with 3.73 and the other time my bud drives his '02 7.3 psd with 4.10s. His is a LB DRW while mine is a SB SRW. His truck has over 60k miles, mine had under 10k last trip. A lot of variables to take into account but ...
I get about 2mpg better then he does over the round trip.
I get about 2mpg better then he does over the round trip.
Junior User
Joined: Jun 2005
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From: San Antonio, Texas
If you are going to be doing a lot of towing/hauling then the 4.10s will have better acceleration and all around performance. Since you have the dually option and you have 2 more tires and more weight the 4.10's will probably give you the same performanec of a SRW vehicle. IMO stick with the 4.10s
Elder User
Joined: Nov 2003
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From: Orange Park, FL
I agree with BigF350, the transmission will keep the rpms in the correct range when doing your daily driving. You may see a small drop when cruising at 70, the 4.10 will run a higher rpm than the 3.73. But as for your regular driving the transmission will be controlling your shift points so you won't see a huge difference.
Posting Guru
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From: Lake Mary, FL
Originally Posted by thompson50
I was led to believe that the 4.10 would burn more gas in almost all driving conditions. Additional comments would be greatly appriciated.
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Posting Guru
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From: Lake Mary, FL
Originally Posted by deacjrt
I agree with BigF350, the transmission will keep the rpms in the correct range when doing your daily driving. You may see a small drop when cruising at 70, the 4.10 will run a higher rpm than the 3.73. But as for your regular driving the transmission will be controlling your shift points so you won't see a huge difference.
Higher RPM can means LESS fuel consumed.
As stated before, higher RPM, but less load = less fuel consumed.
Lower RPM, but higher load = more fuel consumed.
4.10's give more mechanical "advantage" over a broader area, allowing the enigne to cruise under less "load" (calculated engine load as referenced by volumetric efficiency).
Load affects fuel much more than RPM.
Very often, by decreasing RPM you increase "load" and use more fuel.
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From: Hendersonville, NC
Originally Posted by Vic_Ferrari
RPM has only a small part to do with it (much smaller than you think).
Higher RPM can means LESS fuel consumed.
As stated before, higher RPM, but less load = less fuel consumed.
Lower RPM, but higher load = more fuel consumed.
4.10's give more mechanical "advantage" over a broader area, allowing the enigne to cruise under less "load" (calculated engine load as referenced by volumetric efficiency).
Load affects fuel much more than RPM.
Very often, by decreasing RPM you increase "load" and use more fuel.
Higher RPM can means LESS fuel consumed.
As stated before, higher RPM, but less load = less fuel consumed.
Lower RPM, but higher load = more fuel consumed.
4.10's give more mechanical "advantage" over a broader area, allowing the enigne to cruise under less "load" (calculated engine load as referenced by volumetric efficiency).
Load affects fuel much more than RPM.
Very often, by decreasing RPM you increase "load" and use more fuel.
Posting Guru
Joined: Feb 2004
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From: Lake Mary, FL
Originally Posted by PSD 60L Fx4
They are gonna wear you out on this one, aren't they?
This is what they will say:
Take them there 4.10's out and install some 3.73's or 3.55's so the dang
revs will drop and you'll save fuel. We all know more RPM = more fuel.
"ASE certified techs: Misinforming the public since 19xx"
The concept of load/volumetric efficiency is (surprisingly) a little understood subject...especially among "tuners" and certified techs or (I love these) "general automotive specialists".
More RPM can (and often does) mean less fuel consumed.
Postmaster
Joined: Jun 2004
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From: Milky Way Galaxy
Just to throw another example into the mix. My '04 CC LWB DRW w/4.10 's gets, according to the trip meter 13.2mpg, by hand calculating, slightly closer to 14mpg. Stock size tires and mostly trips over 40 miles. Half of those are loaded with close to 2 tons in the bed. And like most, the speed I drive at is directly proportional to my work load for that day.
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