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Old 03-12-2010, 09:49 AM   #1
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Diesel vs. Gas Mileage

I kinda hijacked another thread on a new diesel F250, and thought I would start this thread to move the conversation to a more appropriate place.

Here is where I hijacked the other thread:

Had to get a new truck!

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Originally Posted by MightyMike View Post
YIKES!!! A 5.4 to that, hope you're ready for the shock at the fuel station. I really love my 6.4, it's an awesome motor for pulling heavy loads. Just can't believe the rotten fuel mileage they get. Nice truck!
Not to totally hijack Ed's thread (hey, that rhymes ), but I had always presumed that diesels got better fuel mileage than gassers, especially under load. Sounds like you have experienced both engines. Care to elaborate??
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Old 03-12-2010, 09:56 AM   #2
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And to carry over the 2 replies from the other thread:

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Originally Posted by grhodes50 View Post
Congrat's EdJunior. Enjoy that truck! Your gonna love those heated seats on cold mornings! Don't know if you had one before, but the in dash brake controller works great.

I have the same year and model as EdJunior except mine has the 5.4. Works for me since I only have a few rolling hills where I travel. Sufficient power and outstanding stabillity.

I know EdJunior will enjoy the power but I'll bet he'll get better mpg's than I do.
The best I've got is 16 mpg unloaded, 8.5 mpg towing.
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Originally Posted by Ed H View Post
Nice truck and you'll find parking in a normal slot is interesting. I HAD a nice Ram 2500 megacab with their CTD. Loved it but wife said we need to save some money. So I traded for a gasser 2500. Talking about mileage - I get 15mpg if I'm lucky and pulling 6500 pound 831rlbss I get 7.3. With a 32 gal tank I'll be empty in some 220 miles on mostly flat lands from batesville MS to Jackson TN. And running 89 oct is the same price now as diesel. Sure wish I had my megacab back. But I'm sure you'll enjoy your 250. After the 2007 models with their particulate filters and egr valves the mileage dropped from the 20s to the teens. I found that particulate filter the killer mostly.
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Old 03-12-2010, 12:18 PM   #3
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I would like to have something cleared up from what I have been told, I hear that with the price of a truck equip with a diesel, the price of diesel fuel and the maintains that there is a long term recovery then what there is with gas engines, is this true?
I do not own a diesel, I have a 6.0 Vortec in a heavy duty 1/2 with a 4:10 rear and average 16.5 to 19.5 with out towing and around 10 towing and I am sure that will very on what part of the state I go. With my truck being a 2008 I only have 10,000 miles on it, I guess I am at the max gas mileage.
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Old 03-12-2010, 12:46 PM   #4
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Wade, I get a little better in both towing and non-towing, but not by much. I have a smaller engine (5.4) and a little stiffer gears (3.73). In the hill country that we have around here, I sometimes wonder if the lower final drives might actually help the gas mileage. That 4.10 and bigger engine will definitely help you off of the line.

Again, I am not trying to start a war here with diesel vs. gas fuel mileage. I just want to hear a viable discussion on the pros and cons so if I decide to get a new truck then I can make an informed decision on which way to go. The maintenance cost that Wade brought up is another part of that equation.
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Old 03-12-2010, 01:24 PM   #5
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I think the end result is how one drives, It may balance out. All fuel testing is done under perfect conditions and expert driving to get the best it can do for ratings. I hate to say this but no one is perfect in the real world. Most people that are on the road are gas and go drivers, no reguards to tire pressure just one little thing that can mke a differance no matter what type of engine one has.
One thing that was said to me when I sold my 3/4 ton Suburban just before we had the big snow fall, the gentleman that bought it said he knew that my vehicle was the one for him because he saw the camper in the driveway and he knows that people that RV take care of there vehicles....So I must say we RV'ers are recogized.
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Old 03-12-2010, 04:16 PM   #6
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The upfront cost of a new diesel as opposed to a gas engine is pretty high. Around $5k if I remember correctly so the return on investment is long term for a diesel. As far as better mileage goes I guess that just depends on what you tow, where you tow, and how you tow.

I got anywhere from 7.5mpg to 11mpg with my last 5'er towing at 70mph plus. With my current 5'er I get anywhere from 10 to 12.5 towing 65mph average. This is with a 2000 F350 4 door dually with the 7.3 PSD and a 4:10 rear end. Running dry I get 17.5 up to 20mpg on the highway depending on how heavy my foot is. I bought my truck used so my return on investment is about even I suppose since I now have over 145k miles on the clock.



your mileage may vary
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Old 03-12-2010, 09:38 PM   #7
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Well, I can't add too much to this since I just got my diesel. With my 5.4L towing my 5500 travel trailer, I got between 8 and 11 towing (mostly fairly flat land in Texas), and between 15 and 16 mpg not towing (mostly 65mph back and forth to work). Heresay for the 6.4 is the DPF killed the decent mileage the 6.0L and 7.3L diesels got. The redid the technology in the 2011 Superduty, but the jury is still out since no one has one yet. I needed the diesel because I got a bigger trailer...and a 5th wheel to boot. We'll see how the mileage plays out.
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Old 03-12-2010, 11:56 PM   #8
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Quote:
Originally Posted by mtnguy View Post
I kinda hijacked another thread on a new diesel F250, and thought I would start this thread to move the conversation to a more appropriate place.

Here is where I hijacked the other thread:

Had to get a new truck!



Not to totally hijack Ed's thread (hey, that rhymes ), but I had always presumed that diesels got better fuel mileage than gassers, especially under load. Sounds like you have experienced both engines. Care to elaborate??
Well, I guess I can chime back in. Although not exactly an apples/apples deal, I had in order, a pop-up, a 21' TT,24' TT, 29' 5er, and now a 39' Toy hauler. Towed with, 87 Bronco-302/4 spd man, 89 E150 conv. van, '00 F250 SD, sc short bed-7.3/6 spd man., and now an 08 F350 CC b DRW-6.4/auto. Towing with the gassers I usually got 7-9 mpg towing, 15-18 around home. F250 was bought specifically for 1st 5er- got around 10 towing and 15-18 at home. That 7.3 loved the cetane boost,and I once got 12 mpg (going south, downhill, right?). What I meant by my original comment was the 6.4 mileage was killed by the EPA. Guys on the truck forum post this is to be expected with a heavy truck, but I don't buy that. Big rigs have 18 whls moving 80,000 lbs, and they get as good as these new diesels, what a bunch of crap. As to the cost, I think my diesel was a $6700 option. Throw in 15 quarts every oil change, a filter that costs $20, and maint like an air filter for $115 and multiple fuel filters for another $20, it adds up. Also have to figure diesel avgs. about 0.25/gal more than gas. I'm not complaining, I needed a diesel and that's my deal. I just think people need to really consider all the pros and cons if they really need one or not. If you figure out how many miles you tow per year, sometimes they just don't make sense. But they sure can PULLLLLL..... And as for the new Ford motor, can't see how the mileage is going to improve that much. Still has to meet all of the EPA standards, plus now their getting eurea.
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Old 03-13-2010, 12:28 AM   #9
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Well, DUH! Just realized I never put up my current #s.(Gotta do a little work now and then!). My 6.4 only gets about 10mpg around home. Goes anywhere from 8-10 when towing.(Yeah, I didn't believe it stayed the same, either). And putting Cetane boost in it does absolutely nothing. I absolutely love this truck, just hate the mileage deal.
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Old 03-13-2010, 01:11 AM   #10
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Does anyone out there have a Dodge 2500 with the 6.7L Cummins? What kind of mileage does it get compared to the earlier 5.9L's?

Dave
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