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Old 02-26-2013, 04:31 AM
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thoughts on fuel mileage difference from duramax/cummins

Have a couple buddies with duramax's and Cummins and was wondering why do they get such better mileage, especially the duramax? The one gets 25-26 regularly and the other has hit 30 on occasion! And yes that is hand calculated. Only thing I can think of is the difference in fuel delivery system, weight, and gearing/ tire size. Biggest difference I see is the tire size gearing issue. Duramax has 31" tires stock with 3.73 gears and mine with 20" wheels is 34" stock with same gears. Is the motor just working that much harder? Would a change to 4.10 or 4.30 help? Just can't figure out what the huge difference is. Anybody have any other ideas?
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Old 02-26-2013, 06:40 AM
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I would say your buddy has a 2 wheel drive regular cab and never goes above 55 or he probably should check is math again. Why is it that the Chevy and dodge guys love to inflate there miles per gallon numbers wow us Ford guys arent afraid to admit we get crappy mileage
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Old 02-26-2013, 06:52 AM
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Quote:
Originally Posted by F350$PIT View Post
I would say your buddy has a 2 wheel drive regular cab and never goes above 55 or he probably should check is math again. Why is it that the Chevy and dodge guys love to inflate there miles per gallon numbers wow us Ford guys arent afraid to admit we get crappy mileage
Well you could not be more wrong. The guy getting 30 is my best friend and a 100% honest guy, I spend every weekend with him and I am quite offended that you would call him a liar. And they are both crew cab 4x4s. And he doesn't get 30 all the time but has on long trips with cruise on 70. He averages about 26 though with regular driving.
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Old 02-26-2013, 07:06 AM
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Didn't mean to offend you I have just known too many guys telling me there cumins and duramaxes get mid twenties then mysteriously when I am with them they are are getting the mid teens the rest of us get.
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Old 02-26-2013, 07:17 AM
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I have a 05 F250 FX4 for 3 months now and have found the MPG to be 14.8 (4 hour road trip- 65 mph). I hear others getting 16, 17 so I am thinking of getting an SCT livewire to try to help the truck. Oh Yeah, I have 3.73 gears, 285x17s, and all factory engine with no mods at all on the truck.

I have heard and seen Dodge getting 18-24 on 2wds and 4wds. CCDEMO71, I thinking it is just in the way there built like you said. I am not a mechanic, unless you include shade treeing, so I do not know the specifics to the trucks.
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Old 02-26-2013, 07:20 AM
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duramax is lighter... and they are very capable of low 20's with ease a good tune and few other minor mods and it can be done. crew cab long bed with a brush guard and all it gets 21-22 it all depends how you drive. i do think that his turbo just spools smoother and the truck drives a bit more like a gasser than mine does. but in summer time i too can get damn near 20 mpg 19-21 id say in the f250
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Old 02-26-2013, 07:22 AM
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Besides its been my experience that even the most honest guys are willing to embellish the truth on 2 things. The mpg of their truck and the size of their unit.
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Old 02-26-2013, 07:54 AM
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Re: thoughts on fuel mileage difference from duramax/cummins

Quote:
Originally Posted by ccdemo71 View Post
Well you could not be more wrong. The guy getting 30 is my best friend and a 100% honest guy, I spend every weekend with him and I am quite offended that you would call him a liar. And they are both crew cab 4x4s. And he doesn't get 30 all the time but has on long trips with cruise on 70. He averages about 26 though with regular driving.
No one believes you know a guy that gets 30mpg with a 4x4 diesel truck. Sry to burst your bubble. Log this in the dumb thread/question column.
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Old 02-26-2013, 08:08 AM
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Originally Posted by F350$PIT View Post
Besides its been my experience that even the most honest guys are willing to embellish the truth on 2 things. The mpg of their truck and the size of their unit.
That's the truth. Two most lied about things on earth right there. I don't believe for one second any diesel 4x4 truck gets 30 or anywhere near it. But I have seen a duramax get 21.5mpg and I was following him in my Superduty and got 19.3. Both running the same speed and both crew cab 4x4 on 35's and we stopped to fill up at the same place to calculate it. I guess they are just more efficient motors.
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Old 02-26-2013, 08:20 AM
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Originally Posted by DoubleDpsd View Post
No one believes you know a guy that gets 30mpg with a 4x4 diesel truck. Sry to burst your bubble. Log this in the dumb thread/question column.
You can take your dumb thread/question column and shove it up your @$$. I don't really care if you believe me or not. Let's say I'm a liar and he only gets 24. Still what is the big difference? We are lucky to hit 20 with most being mid to high teens if they are lucky.
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