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Diesel Fuel Mileage


Old 08-02-2012, 07:40 PM
mdrcasper is offline
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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, 08:00 PM
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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.
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Old 08-02-2012, 10:11 PM
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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
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Old 08-20-2012, 01:49 PM
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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, 09:12 PM
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18 on the highway, 15 around town and off road
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Old 08-20-2012, 11:42 PM
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there are so many things that can effect your fuel mileage.
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Old 08-21-2012, 03:03 PM
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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.
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Old 08-22-2012, 06:55 PM
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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
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Old 08-23-2012, 05:42 AM
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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, 10:46 AM
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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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