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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 06-02-2009, 07:21 AM
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Default Does a diesel get better MPG than Gas?

if you took two comparable trucks, lets say the chevy 2500 HD gas, vs the chevy 2500 HD duramax diesel, and you drove them around town, then the highway, then towing .... which one would get better mpg?
Old 06-02-2009, 07:27 AM
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Originally Posted by warmpinkcenter View Post
if you took two comparable trucks, lets say the chevy 2500 HD gas, vs the chevy 2500 HD duramax diesel, and you drove them around town, then the highway, then towing .... which one would get better mpg?
I've got both of these trucks in my business. The gasser gets around 12 mpg at a normal weight of 8,000 lbs. while the diesel (my personal truck) gets 14.5 to 15.5 mpg at a gross of 8,700 lbs. These are for in town useage.
Old 06-02-2009, 07:28 AM
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duramax.
Old 06-02-2009, 07:35 AM
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Diesels typically do better. As they say in the commercials, "individual results may vary". Some of the new super efficient gas engines are sqeaking out more MPG on the highway, but do it with less torque and higher rear end ratios than diesels. This causes them to work harder when towing and show a larger mileage drop between towing and non towing than diesels do. Bottom line, a diesel will nearly alway give you better mileage when towing it's rated load over a gas engine. If you're just going to the prom, it's a tossup.
Old 06-02-2009, 08:05 AM
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I had a Navigator and a Ram 1500 with gassers. In town around 13 and towing 8,000 # boat, 9 or so.
A diesel Excursion is getting me 19.5 around town and 12-13 towing. For my "individual results", diesel is 50% more efficient than gassers.
Old 06-02-2009, 08:15 AM
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Originally Posted by warmpinkcenter View Post
if you took two comparable trucks, lets say the chevy 2500 HD gas, vs the chevy 2500 HD duramax diesel, and you drove them around town, then the highway, then towing .... which one would get better mpg?
I have a Chevy 2500 HD with the Duramax and my buddy has the exact same truck but gas

I get ~17 mpg and he gets ~11-12 mpg

Go diesel. Better resale too
Old 06-02-2009, 09:05 AM
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My 2007 GMC Quad cab Duramax 2500HD gets 22.6 mpg on the highway without a load. I have done as well as 25.2 mpg if I keep the speed down to under 67 mph, but that's no fun in that truck.When towing my 14,500# boat and trailer, I get 14.6 mpg combined town / highway. All in all, I would say that is much better than the gas jobs that are currently on the road and in my area gas is now more expensive than diesel fuel.
Old 06-02-2009, 09:07 AM
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theduramax gets pretty good mileage,especially towing. i think the 04-07 is the best but not 100% on the years, Go with the diesel, you won't regret it
Old 06-02-2009, 10:14 AM
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Last weekend I made a trip to eastern Tn. to visit my brother and pick up some wood for my house. I loaded about 1200 bd ft of poplar in the back of my pickup. It was full over the bed and a bit out past the tailgate. On the way home I got 21.4 mpg driving a little over 70. I don't think a gas can do that.
Old 06-02-2009, 10:23 AM
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got an 05 duramax and depending on if I run it stock or if I program it I can get 26 on the highway and for towing I can program it and get 15-16
Old 06-02-2009, 10:36 AM
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Another comparison is;

I had a 2500 HD Gas Truck (Dodge Ram). And now I have a 2500 HD Duramax.

I get 100 miles more out of tank of diesel than the gas truck did. (Same size fuel tank).
Old 06-02-2009, 10:45 AM
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Diesel- better MPG in any scenario.
Old 06-02-2009, 10:48 AM
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I believe that I got about 40% better milage in town and around 50% better towing milage with my 2003 Duramax that with my old 496 Vortec. Those mileage figures have dropped a bit since the introduction of the Ultra Low Sulphur Diesel but I think the mileage of the diesel is still better and the power comparison, Duramax to 496, is so much better in favor of the diesel it is laughable. Go diesel if you can and have a choice.
Old 06-02-2009, 11:43 AM
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i went diesel last year, and love it. I bought a Mercedes GL, the bigger SUV. I get 28 per gallon highway. Tows boat great.
Old 06-02-2009, 03:33 PM
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Its chemistry - diesel has more energy per gallon.

Diesel - 139k btu per gallon
Real Gasoline - 125k btu per gallon
90% gasoline / 10% corn subsidy - 120k btu per gallon

Plus physics - diesel engines can also operate at a higher compression ratio than gas engines and produce more usable power per btu.
Old 06-02-2009, 04:23 PM
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I have a Dodge 3500 Ram Mega Cab not much fun to drive I get 17 back and forth to work but 10 when hauling my 27 Contender but I can pull it at 70 mph if I want to with no trouble at all. It is a hauling machine. You could play Ping Pong in the back seat excellent truck
Old 06-02-2009, 04:36 PM
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Originally Posted by ChuckDSlayer View Post
got an 05 duramax and depending on if I run it stock or if I program it I can get 26 on the highway and for towing I can program it and get 15-16
You guys make me drool with that kind of MPG. I thought the Excursion with almost 20 was great (compared to gassers I had). Mine is a 2003 model 7.3PSD. For you to get 26 is super...is there a Duramax in an Excursion style Dodge? I need the closed area instead of a P/U.
Old 06-03-2009, 12:48 PM
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Originally Posted by warmpinkcenter View Post
if you took two comparable trucks, lets say the chevy 2500 HD gas, vs the chevy 2500 HD duramax diesel, and you drove them around town, then the highway, then towing .... which one would get better mpg?
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.
Old 06-04-2009, 07:09 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.

if its an obvious answer then why dont truck companies put the mpg of the diesel trucks on the windshield sticker?
Old 06-04-2009, 07:38 AM
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Originally Posted by warmpinkcenter View Post
if its an obvious answer then why dont truck companies put the mpg of the diesel trucks on the windshield sticker?
Trucks and cargo vans over 8500 lbs GVWR, gas or diesel, are exempt from CAFE standards. And if you didn't already know that diesels got better mpg than equivalent gas trucks, then you haven't been paying much attention.

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