Mileage

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Mar 10, 2003 | 09:37 PM

#31

orcaburger

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Re:Mileage

[quote author=Pit Bull link=board=5;threadid=11329;start=15#113630 date=1047249044] [quote author=orcaburger link=board=5;threadid=11329;start=0#107984 date=1046013390] Just put 8K mi on new 02 Cummins. Getting 10 to 13 mpg. Talked to 2 dealers who said it takes 8 to 10K mi to break-in before maleage improves. Can anyone tell me if this is true or do I have another problem? My old 92 got about 18 mpg. [/quote] Need more information. What is your truck? 2500 or 3500? 4x2 or 4x4? 5sp, 6sp, automatic? 3.55 or 4.10? What climate do you live in? Do you idle, how long? City driving and a lot of traffic or hiway, what is the mix? Do you drive it hard or baby it? My 2002 3500 4x4 ETH/DEE with 3.55 lsd. I have 6K miles run 70% hiway and 30% city, don't idle much, and drive it at around 2000 rpm most of the time. I also carry 600 lbs of sand bags in the bed this time of the year. I am getting 16 mpg on winter blend. I figure that without the sandbags, another 10K miles on the truck and summer blend fuel I should get 20 mpg. [/quote]

Mar 10, 2003 | 09:45 PM

#32

jr22

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From: Northwoods of Idaho

Re:Mileage

i have a 02 quad cab dually diesel auto trans 4:10 gears, ran from wisconsin to minnesota about 950 miles in 30 hours avg about 14.25 mpg goin about 70 mph at 2100 to 2300 rpms,thanks jr

Mar 11, 2003 | 09:49 PM

#33

redram

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From: MB,Canada

Re:Mileage

'02 2500 ETH 4x4 SB QC Empty 19 mpg Truck and empty(5500#)trailer- 12mpg Truck and loaded(~17,000#)trailer-10mpg Highway driving, temps around 5-10 deg.F, burning #1 Diesel Honestly, I don't think you'll find a truck getting much better mileage while towing above noted weights under these conditions.

Mar 12, 2003 | 12:17 AM

#34

Guest

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Re:Mileage

'02 3500 6x6 6spd 3.54 gears Edge w/o wire 275 injectors 4 inch straightthru exhaust BHAF

#2 diesel, combo in-town and highway driving, but highway driving is in mountains, and most driving is approx. altitude 2000 feet or more --

@1000 miles: 15 mpg
@5000 miles: 18 mpg
@7000 miles: 20.5 mpg

Breaking in nicely. By my calculations, I should be getting 103 mpg at 100,000 miles -- assuming y'all are correct in telling me these engines aren't broken in completely until then.

Mar 12, 2003 | 08:50 AM

#35

Pit Bull

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From: SW Missouri

Re:Mileage

GP You think your modifacations are adding a couple of MPG? I have 6K miles on mine with 3500 4x4 ETH/DEE 3.55's and I am getting 16 mpg combine on my last fillup.

Mar 12, 2003 | 02:05 PM

#36

Guest

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Re:Mileage

Ya, I expect so -- half 'n' half, maybe -- part break-in, part light bombing. I have seen a "substantial" increase since the initial improvement with the bombing, however. I took a lot of care during the initial 1000 mile break-in -- variable speeds and loads, etc. That may've helped. I have a pretty light foot, except when I don't ;D -- that's a factor, too. GP

Mar 13, 2003 | 05:05 PM

#37

orcaburger

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Re:Mileage

Mar 14, 2003 | 07:19 AM

#38

TXRAM2

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From: Waller Co. Texas

Re:Mileage

My mpg showed improvement up to about 40k. running empty, 50/50 cty/hwy, about 18.5. 2000 rpm seems to be the sweet spot for good mpg, starts dropping off after that. wk

Mar 17, 2003 | 07:41 AM

#39

fitzer

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Re:Mileage

I had some bad luck with my truck a little while ago, (long story) and had to rebuild the engine. After the rebuild, I was complaining of using about 3-4 litres oil in 7000 kms(4300 miles). The rebuilder said it should have settled in by 8000 kms, but didn't. Long story short, I kept driving and, finally at about 40,000 kms(24,000 miles) it settled down to normal. The Cummins rings must be extremely hard to take that long to seat in. I've also noticed that my mileage is A LOT better if I keep my revs on the highway at, or under 1900 RPM. Over that and I see an amazing increase in fuel use. It kinda sucks only going 65-70 MPH, but with fuel prices where they are, that's the sacrifice I'm gonna make!

Mar 17, 2003 | 12:30 PM

#40

dihilde

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From: Orange County, California

Re:Mileage

A newbie to CDT and this forum. Bought a used '01 2500 last month...120k ( no towing) miles (looks and runs great). The first 1100 miles I averaged 15.2 mpg. Commuting and in-town 65%, Towing 25% and highway 10%. Moving up from a gas-hog Dodge Van I'm not unhappy but wish mileage was a little better.