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24 Valve 2nd Gen Dodge Cummins 98.5-02 Discussion of 24 Valve 5.9 Liter Dodge Cummins Diesels with VP44 Injection Pumps

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  #1  
Old 05-01-2011, 08:09 AM
Chilly7's Avatar
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Default Gears = mpg???

I'm running a 99 Drw and getting about 14.5 mpgs with 355 gears. I have two buddies that have the same truck running 410's and they get 20 mpgs. I find it hard to believe. Yeah it takes more to get mine going but is it really that big of a difference? Should I swap to 373's.? What is the best setup for this truck?

Chilly7's Sig:*1999 Ram 3500 Ext cab, Drw, 4x4, 4" exhaust, 355 gears, Air dog 100 lift pump, smarty programmer, new vp44, cold air intake, airlift, automatic 106,000 miles
*1989 Eddie Bauer Bronco, 351, C6, 90,000 miles
*1990 Chevy 3500 4x4, built454, 400 auto, 425hp, 14 bolt posi. I can't say anything good about it...... It's a typical P.O.S Chevy!
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  #2  
Old 05-01-2011, 09:25 AM
FormerVendor
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Luke Buchanan lukesdiesel
   
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MPG also has a lot to do with driving habits, gear ratios, tire size, transmission and many other things. I had a 01 6spd speed with 3.55's and my buddy had an 01 Auto with 4.10's. Bone stock he usually got 1-2 mpg better than I did. But I am also 32 yrs old and he is 57 yrs old. Our driving habits are totally different.

Now if you do much towing you will like 4.10's or a higher gear ratio.
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  #3  
Old 05-01-2011, 09:27 AM
turbo20psi's Avatar
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What size tires is on the truck? 3.55 gears you should get better then the 4.10s. Bigger tires will change the MPGs. You have the smarty is the tire size correct?

My driving habits=

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  #4  
Old 05-01-2011, 09:29 AM
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Default Gears = mpg???

If you are doing a lot of in town driving don't look for much more. I was avg around 16-17 in town with my 3.55s however when you get them out on long runs that's where the high gearing helps. I could see any where up to 21mpg just depending on driving habits when I went on long trips

rednekroper05's Sig:2006 3500 drw 4x4 smarty,edge juice/cts, 5" straight to 8" tip.
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  #5  
Old 05-01-2011, 09:57 AM
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Tire size = 235. yeah I adjusted the speedo with the smarty. It is just weird. I don't drive with a lead foot.
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  #6  
Old 05-01-2011, 10:31 AM
NadirPoint's Avatar
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Default Environment Would be My Guess

Are you talking straight highway long-distance, mixed, start-stop around town? Being more mixed mode leaning to start/stop would explain it. Taller gears only translate to better mpg on the highway, all else being equal. Higher gears means worse fuel mileage in urban environments with a lot of start-stop driving.
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  #7  
Old 05-01-2011, 11:27 PM
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it also depends on if they are trusting the overhead or hand calculated. I will take my 3.55's any day over 4.10's

01quadcab's Sig:01 edge drag comp, fass 150 with vulcan big line kit,amsoil front to back,custom cold air intake with s&b filter with compounds and trans by Jefferson State Diesel 683hp vp truck. 11.91 1/4 http://jeffersonstatediesel.com Now back stock. 95 f350 crew cab fummins in the works. 12v 215 pump 4k, towing cam, compound turbos, ddp 90's, billet 47rh, Spec Rite triple disc converter. getting close to being done
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  #8  
Old 05-01-2011, 11:35 PM
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Default Gears = mpg???

Originally Posted by 01quadcab View Post
it also depends on if they are trusting the overhead or hand calculated. I will take my 3.55's any day over 4.10's
I liked mine for running down the road empty but my355s killed me towing and in town. It's also a pia for trying to idle around pastures check fences and stuff.

Also it is possible for a truck with 4.10s to get 20plus my old roommate had a 01 3500 that got around 20 mpgs hand calu. on a regular basis
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  #9  
Old 05-02-2011, 12:24 AM
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If I had 4.10's I would want a pretty tall overdrive ratio, maybe even a gear vendors.

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  #10  
Old 05-02-2011, 05:28 AM
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I do about 60% city and 40% highway
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