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Old 03-05-2008, 04:58 PM   #1
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Mileage for gas trucks vs diesel trucks?

I have a 2007 silverado with a 5.3l. I was thinking of getting a dodge ram megacab with a diesel 2 wheel drive, 3.73 gears. It is a 2007 with a 5.9 l, i was wondering what kind of mileage i would get when towing and without towing? The price is great, for a brand new slt, it's 28.700, I wonder if i could get better than 11.8 average miles per gallon towing that i get with the silverado. Thanks for the help.
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Old 03-05-2008, 05:14 PM   #2
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Well all I can say is trading a 07 in for an 07 is going to be painful indeed. Your only towing a 23, do you plan to go to classic series in the 30 plus range? Its your money, but unless you can really justify the loss on your Silverado, or if you are like me in a lease and can get out by selling for the payoff, then be patient my friend. You may want to follow the thread on diesel cost/gallon these days. In my opinion you need another reason for such a huge increase in tow capacity, saving money on mileage is going to be tough to justify.
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Old 03-05-2008, 05:43 PM   #3
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Gas vs Diesel

The cost of changing may not be the best finacial move. You have a 23 ft trailer and the V8 gas can do an adaquate job of moving it.
I have a 2007 dodge w/6.7 and pull a 30 ft classic, 8000 lbs dry. I adverage 11 to 12 MPG in stop and go and open road combined, 19 to 20 not towing.
You will get better mpg towing because of the muscle of the diesel but check the price of diesel vs gas.
If you plan to get a larger trailer 28 ft +, the diesel may be good.


dale
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Old 03-05-2008, 06:00 PM   #4
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I paid 30k for the silverado, it is one year old, my wife totalled our honda accord last Feb and i had to get something to replace it. So at the time there were no rebates, i will only get 16k for the trade that is black book. But it has 27k for miles and needs brakes and tires already, i tow quite a bit and will be going cross country april 15th or so. I know i'll take a beating but it is a great price on the dodge. Most likely we will get a bigger AS to spend winters in FL, nothing is set in stone though.

Rebee, could you tell me what mileage you get while towing? Thanks

By the end of this trip i will have close to 50k miles and it will be worth that much less, i mostly only use it for towing. So i'm figuring i will just get 5 years out of it if i'm lucky, diesels do last much longer. For the extra 13 i'd have a much beter towing machine. It's also a 2500 and my silverado is a 1500.
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Old 03-05-2008, 06:19 PM   #5
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'chinup....

IF you travel a LOT a diesel rig is nice. i sure like mine.

IF planning to go larger with the 'stream eventually, you will be ready too.

there are several MILEAGE, mpg and 'fuel savings' threads here, try reading some of them.

there are also threads on the 'cost' issue of diesel vs petrol. lots of variables like resale value and maintenance are vaguely included.

i like the torque and i love the smell of diesel in the mornings!

exceptional mpg reports are as accurate as big fish stores and smell similar too...

there are so many variables, but frontal air resistance is the most direct factor as SPEED climbs.

so how slow are u willing to drive?

because going SLOWER is how the most significant mpg gains can be realized.

your trailer will be very little work for the cummins sludge burner but fast still kills fuel economy.

WIND is also important, moreso than inclines, because uphill is eventually offset by down...

my powerstroke mpg pulling a 34 at 70 mph varies 2-4 mpg as winds change from heads to tails...

10-13 mpg is typical, and a tad more IF you go 60 mph...

i almost never go that slow and judging from this thread most diesel drivers here don't either...

http://www.airforums.com/forums/f463...lly-36727.html

cheers
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Old 03-05-2008, 06:51 PM   #6
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I've posted this same info on another thread before.
My rig is very clost to the same as yours. 2001 GMC 5.3 pulling a 2006 23' Safari SE.
At 65 it gets shy of 12 MPG. At 55 (and driving for fuel economy) just under 15 was best. but more normal about 13 or 13 plus. This is as large of a trailor as i'd want with this truck. It handles great and capacity of truck and tow vehicle is 83%. Just right in my opinion. No payments on the truck and easy tow with fair GPM and cheaper than deisel oil, I think not to bad but would love to do better anyway. Im thinking of putting an aluminum boat on top of the shell on the PU. That would take the 18" or so of flat area below the curvature of the AS and break the wind. I'm intrested in hearing if anyone thinks that might help or if the 100 lbs. of so extra weight would be a wash.
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Old 03-05-2008, 06:52 PM   #7
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yeah, what he said, plus one more thing. Right now Diesel is is +$.47 more than regular so it's a penality to run one ($94 to fill up my Ram this afternoon ) It takes a 15% increase in fuel economy over a gasser just to wipe out the price difference!
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Old 03-05-2008, 07:01 PM   #8
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The 11 to 12 mpg is what I get towing the Classic. You will do much better with the 23 ft. I try to stay around 60 mph but I drift to 65+ because the cummings is so capable.

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Old 03-05-2008, 07:09 PM   #9
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Quote:
Originally Posted by Glenn G
... Im thinking of putting an aluminum boat on top of the shell on the PU. That would take the 18" or so of flat area below the curvature of the AS and break the wind. I'm intrested in hearing if anyone thinks that might help or if the 100 lbs. of so extra weight would be a wash.
hi glenn

i think u will only know what the boat does after it is UP there....

while the boat does change the frontal profile slightly, it also adds drag from surface area.

i'm certain that adding a camper shell lowered mpg on my truck...

so did BIG mud flaps.

we could do things to improve the aero/fuel economy side of these big trucks,

like lower them, change front facia/bumpers, cover the wheels and underside, change tires, ditch the 4x4, change gearing and so on...

but i'm not sure any of of those trick would help TOWING mpg...

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Old 03-05-2008, 07:19 PM   #10
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I just posted this on another (3/4 ton) thread. I don't think you NEED diesel for a 23, but would agree that is max for a 1/2 ton.
Glen, my towing data includes multiple water toys on top of the truck FYI; porta-bote and 1 or 2 kayaks, as well as bikes, ob motor, and ? in the bed. So I am not very aerodynamic when towing (to say the least)...

These are based on 1/2 ton 5.3l Suburban (3:73) and the D/A CC.


Unloaded Highway
A tank of diesel, on the high way gets me about 400 miles @ $3.70/gal= $96.20/tank or $96.20/400 miles.

A tank of gas with the Suburban, on the high way got me about 400 miles @ $3.00/gal= $105.00/tank or $105.00/400 miles.

Unloaded In-town
A tank of diesel, in-town gets me about 315 miles @ $3.70/gal= $96.20/tank or $96.20/315 miles.

A tank of gas with the Suburban, in-town got me about 315 miles @ $3.00/gal= $105.00/tank or $105.00/315 miles.

Towing
A tank of diesel, towing gets me about 315 miles (26 gals) @= $96.20/tank or $96.20/315 miles.

A tank of gas with the Suburban, towing got me about 250 miles @ $3.00/gal= $105.00/tank or $105.00/250 miles.

Disclaimers;
I never run the tank to “empty” so neither case represents a “full” tank of fuel (26 gals for the diesel truck, 35 gals for the ½ ton Suburban. i.e. Don’t confuse this analysis with mpg). A “tank is being defined as the point where I typically stop to fill up, I always tank up when I get under ¼. The mileage figures per tank ARE accurate. I am totally anal about setting the odo and re-fueling based on those miles.

Even at the high cost of diesel today (I am sure it is related to heating season and will come down soon) I am still ahead of the fuel cost/mile game driving the diesel, only slightly in day to day driving (8%) , but dramatically (43%) when towing.. I am not saying one is better than the other, but these are real costs, based on my experience for anyone considering a new TV today and concerned about real world fuel costs.


And there is no question which one I would rather tow with.



Bill
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Old 03-05-2008, 07:33 PM   #11
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2air & Bill,

I have the shell so that's part of the calcs.. Thanks for the feedback.

Glenn
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Old 03-05-2008, 07:40 PM   #12
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2008 Silverado Mileage

Around Thanksgiving I bought a 2008 Silverado 2500 (3/4 ton) - quad cab, long bed and made an initial tow to the Can Opener. I drove 65-75 mph most of the way and got almost 14 mpg towing! Driving highway not towing and keeping it at 55 mpg my mileage has been improving as the engine gets more broken in. Last week not towing I got 18.4 mpg!

My previous vehicle was a 2003 Suburban 3/4 ton, and it got 13 mpg tops. Towing was between 10 and 12 mpg.

I'm impressed.

Paula
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Old 03-05-2008, 07:58 PM   #13
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Here is a previous post on our 2005 Dodge with the 5.9l Cummins, mileage with and without a low shell on the back.


We can weigh in on this issue. We have a 2005 Dodge Ram 2500 with the Cummings diesel. In fairness I can't tell the difference in fuel mileage. Towing on level freeway at 55 to 65 and under good conditions we typically average 13.5 to 14.5. Head winds and quarter winds, speed, weather and terrain can cause towing mileage to vary between 10 mpg to an ocasional 17 mpg both with and without the shell. However I pulled out the five trips we did in two subsequent 12 month periods.

We pulled our first Airstream, a 22' CCD and then a 25' CCD for about 11,000 miles in 2005 before we got our cab high LEER shell. Five trips in that time period were:
772 miles, 13.2 mpg (22')
6765 miles, 13.3 mpg (traded 22' for 25' on trip)
1800 miles, 13.9 mpg (25')
622 miles, 12.6 mpg (25')
1037 miles, 13.0 mpg (25'); average for the five trips 13.3.

Once we got our shell we again towed our 25' CCD about 11,000 miles in 2006:
6626 miles; 12.4 mpg
650 miles; 12.9 mpg
2126 miles; 14.9 mpg
806 miles; 13.3 mpg
795 miles; 14.2 mpg; 13.1 mpg average for these five trips.

It looks too close to call for me and no significant difference with the upgrade from the 22' to the 25' CCD. However, the shell does give us more security for our bikes, generator, chairs and other belongings in the back of the pickup.

Regarding non-towing mileage, 13 to 14 in town; 18 to 20 on the road, freeways and the rural southwest. And for information, our factory trip computer is optimistic, reporting 1 to 2 mpg higher than the real math (miles divided by gallons). My numbers reported above are actual mileae, not the trip computer.
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Old 03-05-2008, 08:40 PM   #14
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Don, do you have a 2 wheel drive or 4 wheel drive? Do you have 3.73 or 4.10? I would expect that the megacab would get the same mileage as you posted. Right now i do 95% of the driving, i think with a bigger truck i would feel safer when i ask my wife to drive. (kinda) lol With such a long trip coming up, i'll be dead tired without a break. Thanks George
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