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Does a diesel get better MPG than Gas?

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Does a diesel get better MPG than Gas?

Old 06-04-2009, 07:40 AM
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Originally Posted by 285exp View Post
Seems like an awfully obvious answer, but I'll assume you're not just trolling and trying to stir up the gas vs diesel war. All else being equal, the diesel will get more mpg. The mpg gap used to be a lot wider before the new, low emission engines were introduced. It used to be that the diesels cost significantly less to operate. Now, between the smaller advantage in mpg, usually higher fuel cost, and higher maintenance cost, the difference in operating cost for the diesel vs gas is shrinking as well.

You will read all sorts of claims by folks with their magical programmers, where they get Camry mileage from their 3/4 ton pickups. Frankly, I think you'll read fewer fantasies in Penthouse Letters, but before you put one on a truck that is still under warranty, you might want to ask your dealer how it will affect the warranty.

I have an '06 6.0 Powerstroke and I am the lucky owner of this "magical programmer" you speak of. Its magical powers are so great that I went from 12-14 city average to 18-18.7 city average, above 22 hwy average and 13-15 towing my 35. To add to that the truck has so much power and is so responsive I couldnt imagine driving the truck without it.

Before you say anything about "the programmers manipulate the dash read out", I have calculated by hand as well. BTW, 99,650 miles, programmer on at 10K, not a single issue or warranty claim.

As long as I need a truck, it will be a diesel.
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Old 06-04-2009, 07:48 AM
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Duramax engine built by Isuzu and has aluminum heads. If aluminum heads on a diesel is ok with you, buy it.

Ford F-250 6.0 diesel (8000 lbs) 3:73 rear, yearly avg of 17.5 mpg

If you're going to do any towing it's a no brainer to go with a diesel


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Old 06-04-2009, 08:00 AM
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Originally Posted by rcoleman View Post
I have an '06 6.0 Powerstroke and I am the lucky owner of this "magical programmer" you speak of. Its magical powers are so great that I went from 12-14 city average to 18-18.7 city average, above 22 hwy average and 13-15 towing my 35. To add to that the truck has so much power and is so responsive I couldnt imagine driving the truck without it.

Before you say anything about "the programmers manipulate the dash read out", I have calculated by hand as well. BTW, 99,650 miles, programmer on at 10K, not a single issue or warranty claim.

As long as I need a truck, it will be a diesel.
I am extremely happy for you. We also have someone claiming 26 mpg on the hiway, does that sound plausible to you?

And if you noticed, I suggested that he check with his dealer to see how it would affect his warranty. Others have not been as lucky as you, and it is not unheard of for dealers to deny warranty coverage on modified trucks.
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Old 06-04-2009, 09:30 AM
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Originally Posted by 285exp View Post
I am extremely happy for you. We also have someone claiming 26 mpg on the hiway, does that sound plausible to you?

And if you noticed, I suggested that he check with his dealer to see how it would affect his warranty. Others have not been as lucky as you, and it is not unheard of for dealers to deny warranty coverage on modified trucks.
I should add that I also have an air filter, but didnt notice an improvement when I put it on.

Does that sound plausible- absolutely- on the highway, with programmer, filter and maybe some exhaust and keep it under 80MPH and on cruise on the flat roads here in FL- I can easily see that. My problem is that my truck does not see under 75MPH on I-95 or I-4
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Old 06-04-2009, 10:08 AM
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Last time I heard, 75 mph was under 80, and 26 mpg would be nearly 20% more than you're getting.

Still not addressing the warranty issue, are you?
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Old 06-04-2009, 12:07 PM
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My Dodge 3500 SWR Megacab Cummins Turbo Diesel has a Magic Box too!!!!

At just under 2000 RPMs right around 64 MPH I can get 20-21 MPG

The Smarty JR (Magic Box) unplugs without a trace, no warranty prob. here.

have not had a single prob with this truck.
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Old 06-04-2009, 12:37 PM
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I am in the diesel truck business. The diesel is a more efficient engine due to the BTUs produced by the fuel and the efficiency of the burn. The turbo is a key factor in this also. I have a "magic box" on my 7.3 Powerstroke Ford and if I keep the tach under 2000 rpms I can squeeze out 21 mpg (hand calculated). Most of the time I get 18-19 unloaded and 12-15 towing. I would steer clear of any of the new engines that have particulate filters and EGR. I am in doubt that there are any Duramaxes or Powerstrokes that will deliver 26 mpg. I have seen a 12v Cummins powered Dodge get 23 unloaded.

BTW, 6.0 Powerstrokes and magic boxes do not play well. The little bitty head bolts seem to stretch when the boost is raised above Ford's already maxed out specs. A chipped 6.0 is a ticking time bomb unless you stud the heads. Ford will not pay for a 6.0 failure if there is evidence that a chip or tuner was installed. They can tell.

Isuzu no longer makes Duramax Engines. Duramax is a division of GM now.
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Old 06-04-2009, 01:18 PM
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Originally Posted by Dantilu View Post
My Dodge 3500 SWR Megacab Cummins Turbo Diesel has a Magic Box too!!!!

At just under 2000 RPMs right around 64 MPH I can get 20-21 MPG
At that speed I can get 15-16 with my F250 Crew Cab 4X4 V10.

The Smarty JR (Magic Box) unplugs without a trace, no warranty prob.
I suppose, if you're not all hung up about that honesty thing, that will work. With the newer diesels it's harder to hide your misdeeds.
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Old 06-04-2009, 03:52 PM
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Originally Posted by 285exp View Post
At that speed I can get 15-16 with my F250 Crew Cab 4X4 V10.



I suppose, if you're not all hung up about that honesty thing, that will work. With the newer diesels it's harder to hide your misdeeds.

Ha HA HA Honesty from an automaker warranty........
They will drag you through a pit of coals not to pay for anything....
And will look to blame you for broken parts to avoid having a warranty claim.....

The Smarty Programmer will plug into any new Dodge truck, any year, and come clean when you offload it..... http://www.madselectronics.com/download.html
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Old 06-05-2009, 07:39 AM
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Originally Posted by Dantilu View Post
Ha HA HA Honesty from an automaker warranty........
They will drag you through a pit of coals not to pay for anything....
And will look to blame you for broken parts to avoid having a warranty claim.....
Looks like projection to me, accusing others of dishonesty in order to justify your own. Kind of hard to blame them for being suspicious when there are people who modify their vehicles, blow them up, conceal that they modified them, and want the mfg to foot the bill. Ya'll want to modify your trucks? Have at it, just man up and accept responsibility.
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Old 06-05-2009, 09:25 AM
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Originally Posted by 285exp View Post
You will read all sorts of claims by folks with their magical programmers, where they get Camry mileage from their 3/4 ton pickups. Frankly, I think you'll read fewer fantasies in Penthouse Letters, but before you put one on a truck that is still under warranty, you might want to ask your dealer how it will affect the warranty.

My dealer didnt care that I had a programmer on my truck. I had 2 warranty claims for injector harnesses that were covered no questions asked. I then got rid of the programmer and started writing my own programs for my duramax using a product called EFI LIVE. It isnt plug and play by any means. All my mileages are hand caluclatedat fill ups. Now that I have a company truck the only time the duramax gets driven is when I am towing the boat 15 minutes to the ramp.

dieselplace.com has a wealth of information as does efilive.com
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Old 06-08-2009, 06:08 AM
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Over a lot of miles of towing the same 3000#rig:

3.3 liter V6 gasser 11mpg
2.8 liter 4 in line diesel 18 to 22mpg

And in addition to the other physics about diesel efficiencies already listed, add one more: A diesel mixture can be leaned much more than a gasser in low load situations, such as idling. A gasser can not run too lean, or it causes pinging. At idle, for example, a diesel consumes a fraction of the fuel of a gasser.
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Old 06-08-2009, 07:10 AM
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My current towrig is a 1998.5 Dodge Ram 2500 4x4 quadcab with a Cummins and 3.55's. It get's 18 mpg daily driving, just under 21mpg hwy,and 14 or so towing. It is modified heavily and puts out 550hp/1100 ft/lbs at the wheels.

My previous truck was a 2000, but identical in every respect except it had the gas 360. It got 12 mpg empty, hwy or DD, and towing I got around 7mpg. And a whole hell of a lot less power.
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Old 06-08-2009, 09:28 AM
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Originally Posted by pbr streetgang View Post
Duramax engine built by Isuzu and has aluminum heads. If aluminum heads on a diesel is ok with you, buy it.

Ford F-250 6.0 diesel (8000 lbs) 3:73 rear, yearly avg of 17.5 mpg

If you're going to do any towing it's a no brainer to go with a diesel


.


200,000+ miles on my aluminum heads and nary a problem. Never even heard of anyone having head problems w/ a dmax unlike the famous head bolts on the 6.0. Injectors are a different story though.

2002 Dmax crew 4x2 and have owned it since new. Bone stock.

cruise set on 78 mph = 19.66666666 mpg (hand calc) If I keep it 70 or below, I've seen 23 mpg.

around town it can get as low as about 15 mpg and I've seen as high as 18.6, but I usually average 16-17 mpg in town.

towing the contender at 72, I get 10 mpg.

towing the flatscat at 75, I get 14 mpg.

Mileage computers were not an option in '02. All hand calc'ed.
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Old 06-13-2009, 01:49 AM
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Default Does a diesel get better MPG than Gas?

I tow a 24 foot Carolina Skiff with a 6 cylinder Toyota Tacoma with six speed manual and 4WD, getting 16+ MPG measured to the nearest tenth gallon, and tenth of a mile.

My wife's cousin wanted to fish on the Virginia Eastern Shore, and we went in his four door 4WD Ford F-250 with diesel. (I think Ford uses the International diesel; someone correct me if I'm wrong.)
We fueled up in Southampton County, drove to Kiptopeake, then to Oyster the next day, then back through Norfolk to go to a gun shop in Newport News, then back to Southampton county. All of this pulling our 24 foot CS, with four adults in the cab. I watched him do the math.........over 22 MPG!

Needless to say, I was extremely envious of that kind of performance. If I had not watched the pump, and seen him do the math myself, I would not have believed it.

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Old 06-14-2009, 08:30 AM
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Originally Posted by RiverRat1969 View Post
I tow a 24 foot Carolina Skiff with a 6 cylinder Toyota Tacoma with six speed manual and 4WD, getting 16+ MPG measured to the nearest tenth gallon, and tenth of a mile.

My wife's cousin wanted to fish on the Virginia Eastern Shore, and we went in his four door 4WD Ford F-250 with diesel. (I think Ford uses the International diesel; someone correct me if I'm wrong.)
We fueled up in Southampton County, drove to Kiptopeake, then to Oyster the next day, then back through Norfolk to go to a gun shop in Newport News, then back to Southampton county. All of this pulling our 24 foot CS, with four adults in the cab. I watched him do the math.........over 22 MPG!

Needless to say, I was extremely envious of that kind of performance. If I had not watched the pump, and seen him do the math myself, I would not have believed it.
You both suck at math. You didn't say what year of truck but it doesn't matter it didn't get 22mpg pulling a 24 boat, even a skiff. Something is not right.
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Old 06-14-2009, 10:01 AM
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Originally Posted by DreamWeaver21 View Post
You both suck at math. You didn't say what year of truck but it doesn't matter it didn't get 22mpg pulling a 24 boat, even a skiff. Something is not right.
Don't be bashful, DreamWeaver, just spit it out what ails ya!

I have to question the truck or the math, too. On it's best days on flat land and at 55MPH or less, the 7.3L Diesel Excursion sees 19.5MPH. Towing any trailer cuts 6 off that number.
Towing a 10,000# boat cuts almost half off of it.
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Old 06-14-2009, 02:29 PM
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Originally Posted by bamaboy473 View Post
Don't be bashful, DreamWeaver, just spit it out what ails ya!

I have to question the truck or the math, too. On it's best days on flat land and at 55MPH or less, the 7.3L Diesel Excursion sees 19.5MPH. Towing any trailer cuts 6 off that number.
Towing a 10,000# boat cuts almost half off of it.
Must have a programmer
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Old 06-14-2009, 03:51 PM
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I bought 09 2500hd gaser and if I opted for the diesel it was more than 6000.00 more that trade off for me is a lot of gas!!! 12 vs 16mpg
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Old 06-15-2009, 09:40 AM
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Originally Posted by rcoleman View Post
I have an '06 6.0 Powerstroke and I am the lucky owner of this "magical programmer" you speak of. Its magical powers are so great that I went from 12-14 city average to 18-18.7 city average, above 22 hwy average and 13-15 towing my 35. To add to that the truck has so much power and is so responsive I couldnt imagine driving the truck without it.

Before you say anything about "the programmers manipulate the dash read out", I have calculated by hand as well. BTW, 99,650 miles, programmer on at 10K, not a single issue or warranty claim.

As long as I need a truck, it will be a diesel.
What brand programmer and what was the cost?

I had an 03 Ford 7.3ptd in the 1 ton 2wd trim and never saw anything above 18.5 w/ an edge programmer. The edge was around $500. The truck got 14-16 w/o it. The power gains were noticeable, but the fuel savings were a toss up.
I now have a Cummins 6.7L that's a beast, 18-20 common empty, 12-14 towing 6500# boat. Heard the stories about the programmer on the cummins, but if it's no greater than 1-2 mpg, I feel it's a waste.
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