Our new Liberty with 22,500 miles just completed its first tank. With 50/50 city & highway driving, 360 miles was pretty much it......which seemed disapointing. Reading what to do about low mileage, I cleaned the map senceor, which was clogged with soot. The air filter is very dirty and that will be replaced tomorrow. Next I will change the fuel filter. I'm not sure how much of a difference all that will make ?

Anything else I can do ?

I read that someone here reached 450 miles per tank and was disapointed with that ! How many miles per tank are you guys getting per tank ? What should I expect ?

Thanks !
Matt

Last tank I refilled at a little below half tank. It took 12.45 gallons to shut off and had gone a bit over 325 miles.

Tires 245/75/16 Revo's at 37 psi.

That is with a lift and with rails, skids, roof light, and 125 pounds of tools along for the ride.

SEGR, Clean MAP, clean Ea synthetic filter, and a free flowing muffler (not crap stock one) have helped. On highway, I think the bigger tires help too (in town they hurt you). Warmer weather helps sometimes-- if you are doing short trips in the cold I would use the block heater to warm the motor up as the viscous heater kills mileage. Perhaps blocking part of the intake to keep the motor warmer when its cold will help. Are you running winterized d1 or regular d2? D1 gets bad mileage.

Bad fuel hurts mileage the most, cetane booster added on a bad tank helps. Goosing it on take off hurts mileage too. If you avoid goosing it you can cruise plenty fast and still get good mileage. I cruised around 75, and got up to 85 for a bit, for most of the 1/2 tank that I was on the highway. I would say 70/30 highway to city miles. Using the cruise control to maintain speed helps as well.

A better number to use is Miles Per Gallon Miles per tank depends on when a person prefers to refuel. My last tank, all city short trips was 21.9 MPG. I refilled at just below half and put in 13.4 gallons and was 295 miles. My CRD replaced a clean 99 XJ (cherokee) that averaged 11 or 12 for the same driving On your air filter. Diesels have a huge appitite for air and a dirty one hurts mileage. Your dirty MAP shows the previous owner didn't hang out here. I have no connection with Amsoil but have one of their air filters and based on the fact I can hear the turbo whine (a good sound) I'm convinced it 's a free flowing filter and it can be vacuumed to cleaned. Expect to change a standard air filter at just about every 6k oil change as it's sized for a gasoline engine. Also air in the fuel filter head will cause poor running and that relates to poor mileage. Check out the "It's 10PM where's your lift pump" thread

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Atlantic Blue 06 CRD Limited (his)
Joined by a 2000 XJ Classic (hers)

Go to http://www.GasSavers.org and open up a "Garage". You need to do about 5 fillups to get an accurate bead on your mpg. One guess is not any indication at all. You have to keep track of the gallons added. You also need to see how much your odometer is off from actual. Mine is off by 6% with just a bit taller tire...even stock they are off about 2.5%.

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Founder of L.O.S.T.
2006 CRD Sport
Mods: GDE Hot Tune w/ 364#@2000rpm/Air Box /3" Str8 Exhaust/ASFIR Alum Skids/245-75R-16 Cooper STT PRO/OME LIFT w/Clevis & 4 Spring Isos/AirTabs/Rigid 10" S2 LED/4xGuard Ctr Matrix Bumper
Drag Strip:Reac=.1078_60ft=2.224_1/8=10.39@64.8mph_1/4+16.46@80.8mph

How many guys have unplugged their mass air flow sensor ? I think its called "off road only" ORO ? Too bad you get the check engine light coming on !

We are in litres north of the border, so instead of coverting it to US gallons, I have always used miles per tank as my indicator.

Anyone else ?

In DC commuting, I get around 360 miles to a tank and I refill with 18.5 gallons weekly. Comes out to be about 20-21mpg. I don't balk at that since most of it is sitting idling or less than 30mph

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Ryan
2006 Ford F-250 PSD CC FX4
**GONE**
2005 Jeep Liberty CRD
SAMCO Hoses//GDE Tune//PML Trans Pan//TransGo HD Shift Kit//MBRP Exhaust

1986 2R Mustang SVO

Last fill up was 17.86 gals and 502 on the odometer. Was running the Striker II on economy mode. Running it on mode 1 now to see if the I get better mpg.

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08 Elantra SE daily driver
2001 F-250 powerstroke

Seem to me that there is a huge difference in summer/winter fuel. In the winter I'm hard pressed to get over 20mpg/400 miles to a tank. Right now I have 460 miles on the OD since I have filled up and I still have over 1/4 of a tank left. I think it also has alot to do with the temp outside b/c of the viscous heater the rig has on her. This is without the ORM, but I do have a new MAF and MAP sensor.Stock tires at 40 PSI

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1973 Buick Centurion Convertable 455/4bb
1988 IROC-Z T-Top 350/TPI/it died
1997 Dodge Dakota 3.9/ dead also
2002 Suzuki Bandit 1200
2007 Jeep GC Diesel Limited

There are other factors at play aside from the winter blend.

- If you're driving at speeds that require OD it takes a lot longer for the tranny to warm to a point where it will lock the torque converter.
- Depending on where you live the AC pump may be running more
- The viscous heater will be running
- If you don't watch your tire pressures they may be lower due to the cold
- You may be using 4wd more etc...etc...

My average is 26mpg in the summer months (June-Sept), peaking at around 28mpg on isolated journeys when conditions are right. In the depths of winter (Jan-Mar) the average is down to 21mpg but never below 20mpg.

450-500 till the light comes on.

I ve noticed the difference up to 200 miles on a tank depending where i fuel ! some places arround here have REALLY poopy booty fuel.

this is driving city/hway with a seriously aggressive driver behind the wheel.

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Liberty CRD 2005
50K miles
ORM / EHM /facet lift pump
Suncoast TC and still shudders...
straight pipe.

I think I may have forgotten to plug my maf back in when I last changed my air filter

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Atlantic Blue 06 CRD Limited (his)
Joined by a 2000 XJ Classic (hers)

Last fill up 373 miles and was half way between 1/4 and empty. Filled to top and 18.43 gallons. I get 20 to 21 mpg. Funny my Jeep will go 250 to 275 from full to half then it seems to go a lot faster to 1/4.

My wife usually drives it and she said the exact same thing yesterday !! Must be shaped like a funnel....so to speak

I know that there are many different things that affect mileage, but I'm surprised at the difference.......350ish up to 500

The most I ever got was 560 a tank. The worst was 19MPG breaking in the new motor (and half of that tank was in 4x4). I think the fuel does have a big impact. This thing loves high cetane.

I agree with the winter summer fuel makeing a big diffrence. I pickup 5-6 MPG between summer and winter fuel.

I would get only 350-400 miles on winter, 450-550 on summer fuel, I have ORM, high flow intake and a glass pack.

I can get another 2-4 MPG drafting a safe distace behind a truck, big van or even a car. its when you pushing all that air out of the way yourself that sucks the diesel.