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Diesel Fuel Mileage

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Old 08-02-2012, 06:40 PM
mdrcasper mdrcasper is offline
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Vehicle: 07 Mega Hemi 4x4
Location: Tucson Az
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Default Diesel Fuel Mileage

Fellow Ram Owners,

I currently own a 07 hemi mega cab 4x4, great truck horrible fuel economy so I am thinking about selling it and purchasing a 6.7L.

I am extremely curious to know what kind of mileage you are getting in your 6.7L and 5.9L diesels on the highway, around town and towing either mega cab or quad cab 4x4's.

Thanks Casper
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Old 08-02-2012, 07:00 PM
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MikeHTally MikeHTally is offline
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Vehicle: 2003 1500 QCSB Hemi 4x2
Location: N. Florida
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It'll take a long time for the slightly-better fuel cost/mile to make up the initial expense and increased maintenance.
2003 1500 QC Hemi

2006 Chrysler 300C 2008 1/2 Mazda Speed3
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Old 08-02-2012, 09:11 PM
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08HEMI1500 08HEMI1500 is offline
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Vehicle: 2008 Dodge Ram 1500 QC
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Diesels consistently get in the high teens for city MPG and low to mid 20s for highway. The 5.9 is basically the God of diesel engines and is the best choice but with some simple mods the 6.7 can get just as good mileage as the 5.9. But as stated the buy in price is crazy high and maintenance is going to be a bitch unless you're a diesel mechanic
2008 Black Dodge Ram 1500 QC, Big Horn Edition 5.7 Liter HEMI
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Old 08-20-2012, 12:49 PM
redbeard redbeard is offline
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I have a 2012 with auto transmission and 373 ratio. I am getting 14.5 running to work and 17 on a trip of about 100 + miles long. It just turned over 5,000 miles
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Old 08-20-2012, 08:12 PM
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verdesardog verdesardog is offline
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Vehicle: 2006 Ram 2500 CTD
Location: AZ
Posts: 94

18 on the highway, 15 around town and off road
2006 RAM 2500 Big Horn 4X4, CTD, lifted, de badged, Steering box stabilizer, 10500#hydraulic winch with synthetic rope, gauges, smarty jr, 2 micron fuel filter, fender flairs, 350/70 R17 tires on custom rims.
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Old 08-20-2012, 10:42 PM
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crazzywolfie crazzywolfie is offline
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there are so many things that can effect your fuel mileage.
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Old 08-21-2012, 02:03 PM
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Jigabop Jigabop is offline
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Vehicle: '00 Ram 2500 6spd twin turbo diesel
Location: Renton, WA
Posts: 3,065

the 6.7 diesels get horrible mileage due to DPF in exhaust and EGR plugging up the intake and the VGT vanes.

5.9 common rail should be getting 17-24...if yours is not you may have a cracked injector tip.

might want to check out the injectors (they are notorious for cracking tips on the common rail engines)

also once you get that done, get a smarty programmer and put in the mileage tune with high timing. it will increase fuel economy a bit and reduce overall EGTs.

if you want lots of power to go with it, you can go with a smarty, or the now more popular EFILive.

as for economy: I get 14, but my injectors suck. they are smokey as all hell and haze at idle. I need to have them pop tested or just replace them as I believe the pop off pressures are all over the place on them and definitely set way too low...probably at 260bar when they should be at 310bar.
'00 2500 Sport 4x4 Cummins, powered by the ultra high performance 53 block and the never failing SOVP44! 576hp 1285tq 8/10/2013
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Old 08-22-2012, 05:55 PM
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scatpack_69 scatpack_69 is offline
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20+ on the highway, 500hp at the tires (for now) and smoke free. All thanks to EFILive tuning...

Usually 14ish in town, but that's far from babying it or trying to max the in-town mileage
2007 Dodge Ram 3500 5.9 Cummins-Goerend-Hamilton-EFILive
2003 Dodge Ram 2500 5.9 Cummins HO-NV5600-6.7 swap
1970 Challenger 318/auto, soon to be 390 stroker
1968 RoadRunner 440/auto. 1968 Satellite 318/auto on the rotisserie
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Old 08-23-2012, 04:42 AM
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Challenger383 Challenger383 is offline
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When i had my, 5.9 2500 6 speed manual, best i got was 24 on the motorway, but dropped to 15-18 round town
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Old 08-23-2012, 09:46 AM
briando briando is offline
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Vehicle: 2008 Chevy Silverado
Location: Elkhart Lake, WI
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when i first got my diesel ram, diesel was cheaper than regular, and since then that isn't even close to being the case, the added mileage is great, but i'm starting to wonder how ahead i really am. should i do the math?
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