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Old 02-15-2011, 01:32 AM   #15
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"I'm from the Show Me State. Respectfully, I can't believe 30-plus MPG figures for a 3/4-ton truck irrespective of the year of the vehicle. I also can't believe 23-plus MPG figures for city driving for the same vehicle. Those are Honda Civic numbers"


I've tried four times to upload an image of the mpg display on the console. You can see it here: http://www.airforums.com/photos/show...atid=newimages

The truck has an automatic transmission. The key to this kind of mileage is to find a truck that has been broken in entirely with highway mileage. This truck had been driven every day (80 miles a day) from home to work and back again at 65 mph. This truck had 75k miles when I bought it. Full break in for a Cummis is about 80k miles. Like I said, I did a lot of research. The other key is to drive a steady 60-65 mph WITHOUT cruise control.

The linked photo was taken after I pulled into my driveway in South Texas after driving it home from where I purchased it in Wisconsin. Actual calculated mpg (miles/fuel) was 30.1 mpg.
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Old 02-15-2011, 01:47 AM   #16
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That aint gonna happen as long as Unkle Sam is involved. Sal.
Actually, so long as the marketing departments are in charge, no one will really know which truck gets better mileage... what we need is a standard fuel economy rating for 3/4 & 1 ton trucks. You can then see the manufacturers competing - which is what we need when diesel hits $4/gal (it's 3.75 here now) this summer. Maybe a city, highway and towing rating....

Nothing like a impartial benchmark to help focus attention on a problem.

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Old 02-15-2011, 07:02 AM   #17
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you better get that display unit checked out, and a new calculator.
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Old 02-15-2011, 08:20 AM   #18
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Actually, so long as the marketing departments are in charge, no one will really know which truck gets better mileage... what we need is a standard fuel economy rating for 3/4 & 1 ton trucks. You can then see the manufacturers competing - which is what we need when diesel hits $4/gal (it's 3.75 here now) this summer. Maybe a city, highway and towing rating....

Nothing like a impartial benchmark to help focus attention on a problem.

- Bart
2016 CAFE regs. will include 3/4 and 1 tonners, which IMPLYS they will be EPA mileage rated. Understand, NO mfr establishes the mileage ratings. EPA dictates all that. The numbers were horribly off for a long time. Until 2009 the formula had not changed since 1978. 2009 changes were mathematical changes to the cycle formula establishd in 1978. The numbers were much closer to what you could expect. There is another revision by th EPA due, which will be a completely new test cycle. I can't remember if that is 2011 or 2012.

HOWEVER, be careful what you ask for. Including 3/4 and 1 tons in the CAFE will have VERY challenging implications for the ONLY 3 TRUE full line auto manufacturers in the US. When the big trucks and vans are rolled into the CAFE numbers (which are going to be VERY difficult to achieve) it may limit the number of trucks a MFR can produce in a given model year. Each truck will have to be offset by several 40+ MPG car sales to be able to maintain the CAFE regulation number.

The penalties for not making the number are sooo stiff that they exceed the profit margin on a per unit basis for the trucks. Could this mean a full line mfr may have to limit the number of trucks produced each year? Could this mean that you may have to prove you NEED a truck for business or farm purposes? Could his mean that the Gubment will indirectly deterime what you drive and determine that your recreational desire is no longer a need and unacceptable? Are all or any of these questions true concerns? Maybe and maybe not, but there is real concern in the industry.
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Old 02-15-2011, 11:28 AM   #19
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you better get that display unit checked out, and a new calculator.
Rock60 you do the math: 1312 miles - 43.6 gallons from Fond du Lac, Wisconsin to Conroe, TX.

Geez! Don't be insulting, ok?

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Old 02-15-2011, 09:13 PM   #20
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[QUOTE=Secguru;952071]Rock60 you do the math: 1312 miles - 43.6 gallons from Fond du Lac, Wisconsin to Conroe, TX.


A number of us who also own 2wd/man trans CTD's see 24-26 mpg hwy, average. The occasional high is nice, but the overall average matters more. The 2003-2004.0 are the best of the 3rd Gen Cummins as 2004.5 and later feature a third injection event and new emissions equipment, but are capable of 22 solo mpg highway-only averages. These are stock trucks as no one is CTD land (enthusiast sites) is showing better numbers with 3rd Gen or later. There are some earlier trucks doing slightly better.

Per your question about toppers: Mine may be worth .75 mpg under the right conditions (no unfavorable winds), but some crosswinds/headwinds are a greater problem. Mine is a cab-height, closely fitting/body contour LEER. I like the 170 c/f under cover, but would trade some space for better aero, and lower resistance to crosswinds.

Among production toppers the best are:

1] Standard hard tonneau cover, overall.

2] Second is a surveyors bed topper, as shown here by Astoria Industries as a mid-height compromise between a tonneau cover and a cab height bed topper.






But the most promise is with an Aerolid, a truly aerodynamic bed topper that shows double-digit percentage increases in mpg.





The concept is being explored by others, DIY, on Ecomodder Forum.

.
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Old 02-16-2011, 01:47 AM   #21
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Talking

Thanks REDNAX. I appreciate the thoughtful information. You confirmed my suspicions that the Touneau will slightly outperform the cab-height topper. I figured that I would lose 1 to 2 mpg. I can tolerate that so that I have more storage.

Love the Airstream but it is short on storage after living full-time in a 37' fifth wheel for 5 years.

My plan is to use a cab-height topper, put in a bed slide and fit that with shelves to store seal-tight containers, a good air compressor, and a 2000W quiet generator. Ahhh, all the comforts of home for our 6 month trips.

I am soooo looking forward to retirement in 2 years.

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Old 02-16-2011, 02:05 PM   #22
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I too am amazed with the mpg's you posted. I have an '06 Dodge 5.9 with the megacab. I have a Leer cap. I bought the truck second hand so I have no pre-cap vs w/cap mpg's to share. Mine is a 4x4 3500 and I have gotten 22+ mpg on the highway and 18 or so around town. Towing my Airstream 30'er I seem to run around 15-17 depending on the terrain. Boy what I would give to see anything near 30mpg's. Whatever you're doing, keep it up. I do like the Leer cap. It looks good and is painted to match. It also has a sliding bed insert. That was something that I don't think I would have purchased. It came with the truck and I live it. Saves my back when I need to put stuff in or get it out. Pretty heavy duty too. I've had about 1000# of bricks on a pallet on it.

Keep it up. Love those Dodges
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Old 02-18-2011, 07:49 AM   #23
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How to get High Fuel Economy

There have been a lot of questions about how I get over 30 mpg from my Dodge 2500 HD Diesel (automatic 4X4).

Aside from selecting a truck that was “broken-in” for high gas mileage, here are my driving techniques:

1 – Never use cruise control. Cruise control maintains a constant speed at the expense of fuel economy. You can drive a reasonably steady speed without cruse and get far better mpg.

2 – No aggressive driving. Rapid changes in speed are the enemy of mpg.

3 – No “Hurry Up and Wait” driving. Time spent at stoplights is wasted mileage. Lift your foot off the pedal and let the vehicle slow down before braking when the light ahead is red.

4 – Leave ample room between cars. This allows you to set the pace, instead of the car ahead of you.

5 – Drive “Anti-Traffic”. When you see traffic turning into freeway stop-n-go waves of traffic, break up the traffic jam by modulating the pace of traffic so that you are not in a stop-n-go pattern. You will benefit, and so will all the traffic behind you.

6 – Take it easy. Anticipate stops, take your foot off the pedal well before the stoplight and slowly accelerate away from stoplights.

Doing these things, you can dramatically reduce stops, which are the ultimate mpg killer.

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Old 02-18-2011, 08:56 AM   #24
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I believe ya got it. IF you actually practice what ya preach. Then that kind of mileage is possible. Our Truck weighs in a about 8k lbs. We get 14 city and 20 highway and 16 towing. I calculate fuel mileage the old fashion way. gals and miles. With a calculator.
I have tried before to tell people here how to drive a diesel . Gentle throttle,pace driving,spacing between cars,timing of lites. No Jackrabbit starts and stops. So what if traffic is passin ya, let em go.You will get there. PEOPLE ya have to give the ole diesel time to make its torque/power and then comes the speed. It's a whole different ball game then drivin a gas job. I drove over the road for 45 yrs and got what I consider great mileage for an 80k lb vehicle, after all, I was the one payin the fuel and tire bill. Sorry I think I forgot the subject. We use a 8ft solid(no windows) cab high wedge cap.Look at all the big trucks and see that they are wedge shaped ,those are aero packages to increase fuel mileage.
Ok off my rant
Hope to see ya all DOWN DA ROAD
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Old 02-19-2011, 01:41 AM   #25
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Thanks Mike.

Good to know that I'm not a complete idiot for driving the way I do. Like you said:
- We're paying for the Gas
- And the Tires
- And avoiding the accidents that aggressive driving can cause

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Old 02-20-2011, 05:57 AM   #26
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I have a campertop on my 7.3 PowerStroke. I think it does not negatively affect fuel mileage. It may actually help.

Loaded with camping equipment but not towing, I can achieve 21mpg with AC on at 70 mph. Weight is about 8000 pounds.

Towing at a speed of 55 to 60 mph with AC on, I achieve between 14 and 17 mpg. My last long trip (about 4000 miles) achieved 14.7 mpg. Weight is about 15000 pounds.

As noted, I don't think the campertop cut my mileage. It probably enhances my efficiency, besides realizing the main purpose of keeping all my camping junk high and dry.
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