- #377 of 391
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Re: 24+ freeway mpg possible with a dually???? [ingarage]
by kcram HOST
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Mar 24, 2009 (5:10 pm)
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Replying to: ingarage (Mar 22, 2009 8:12 pm)
Ironically, you can get a brand new MegaCab dually past 24, since the 2009s offer a very tall 3.42 axle - with the double overdrive of the 6-speed automatic, you should have no trouble reaching 24 in a 2wd truck. If your budget doesn't permit "new", you can likely achieve the same going back to a 2007.5 Ram with the 6.7L Cummins and 6-speed automatic, then have the 3.42 diff swapped in.
The tallest Ford ratio is a 3.73, so you will need to look for a very light configuration... Ford does make a shortbox dually crew cab, bit they are VERY hard to find, as not many people ordered them.
kcram - Pickups/Wagons Host
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- #378 of 391
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Re: 24+ freeway mpg possible with a dually???? [kcram]
by ingarage
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Mar 24, 2009 (9:07 pm)
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Replying to: kcram (Mar 24, 2009 5:10 pm)
Thanks kcram. So is it the 6 speed autos taller top gear ratio I am looking for and was it introduced in 2007.5, or is that when the 6.7 came out? Is the 6.7 a better candidate for a fuel economy project than the 5.9? When did particulate filters come out and are these a factor?
If fuel economy is mostly an rpm thing, why not just add an overdrive or change axle ratios on any 5.9?
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- #379 of 391
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Re: 24+ freeway mpg possible with a dually???? [ingarage]
by kcram HOST
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Mar 25, 2009 (7:29 pm)
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Replying to: ingarage (Mar 24, 2009 9:07 pm)
The 6-speed automatic and 6.7L were introduced together in 2007.5, along with the particulate emissions equipment.
In getting the best mileage from a diesel, you want the rpm as close to the torque peak as you can get for the typical road speed... for a Cummins, that sweet spot is right around 1600-1700 rpm. But since you're driving 65-70 mph, you will need the tall 6th gear of the 6-speed automatic along with that 3.42 axle, or you would need a much older truck (12-valve mechanical Cummins from 1998 or earlier).
I had a 1996 Ram 3500 Club Cab 4x4 dually, 4-speed automatic, 3.54 axles and OEM tires (LT215/85R16E). I could get 24 mpg out of it, but to do it, I had to keep my cruise control at 55. At the same speed, my 2005 Ram 3500 Quad Cab 4x4 dually with 3.73s and LT235/80R17E tires will get around 21.
kcram - Pickups/Wagons Host
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- #380 of 391
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Re: i need help and im new to edmunds [jay7805]
by oochuck
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Mar 26, 2009 (1:16 pm)
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Replying to: jay7805 (Mar 05, 2009 3:24 pm)
Buy the truck you want. On my Dodge diesel I mainly drive from stop light to stop light over the past few years after selling the RV trailer. Going on 90,000 miles and only opened the hood to do the oil change and replace the batteries once over the past 5-6 years. Great way to go. Just purchased the Jeep Grand Cherokee Limited with the Mercedes V-6 diesel. Tows up to 7,400 pounds. My wife also drives from stop light to stop light and has averaged over 17 MPG. Not bad for a 4,700 pound SUV. Economy of a 4 banger and power of a V-8 (376 torque rating). And the price new was $19,999.99. You can check Autotrader.com and put in zip code 75042 with a hundred mile radius to find a few of these new 2007 Jeep diesels.
Good luck to all
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- #381 of 391
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Re: Diesel Mileage [redbearde]
by pipfindr
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Mar 26, 2009 (6:40 pm)
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Replying to: redbearde (Mar 20, 2009 7:34 pm)
Kind of a stupid question but do you have the air conditioning or the "defog/defrost" setting on? both run the compressor and cut in and out most noticeably at idle. turn the setting to vent and see if it smooths out. its a dodge thing. Mine did exactly what you described and my mech buddy reached over and turned the setting to "Hi -lo vent" and the idle smoothed right out. ......
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- #382 of 391
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Diesel vs. Gas
by jet12
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Apr 03, 2009 (8:26 pm)
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Considering trading my '06 F250 SD/SC gasoline for an ' 08 F250 4wd SD/CC
diesel. Never owned a diesel before. only considering because of the deep
discounts on '08. Thoughts? experiences? Is mpg that much better than gas?
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- #383 of 391
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Re: Diesel vs. Gas [jet12]
by akjbmw
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Apr 03, 2009 (11:34 pm)
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Replying to: jet12 (Apr 03, 2009 8:26 pm)
It's way too sketchy to try to justify/compare the cost of diesel vs gas in either direction.
It depends on what you are going to do with the truck.
My gasser worked great as a grocery getter, but didn't do well at all climbing over the Sierras with our travel trailer.
My "new to me" duramax requires caution to not go uphill too fast with the trailer.
Awesome. Amazing. I'm REALLY enjoying it.
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- #384 of 391
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Re: Diesel vs. Gas [jet12]
by pipfindr
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Apr 04, 2009 (7:28 am)
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Replying to: jet12 (Apr 03, 2009 8:26 pm)
Well do some homework. the '08 and up fords are getting very bad reviews. all of my friends who own them (5) almost all say the same thing..... the mileage sucks and they all have had to replace the rads in them, except for one of them and he saying that hes getting 19 mpg and loves it. The fuel mileage for the other 4 guys is the same 11-12 mpg empty or towing its the same. kinda weird if you ask me but as for performance... the new ford rocks. right off the line there is no loss of power or turbo lag. nicest interior of all of the new trucks. ford is bringing out a half ton diesel next year. maybe wait for it. it may be the mix you are looking for.
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- #385 of 391
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bad fuel milag 06 6.6 disel
by 06hdgmc
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Jul 12, 2009 (12:30 pm)
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I am new to this forum but i am interested in seeing what other 06 duramax owners get for milage. I bought mine used  35000 miles it was getting 16 on hwy I had to take it in to dealer to have a fuel problem fixed they replaced high presur pump fule rails and injectors and now the best I can get is 15 mpg my mec is telling me that the 06 never got good fuel milage so if there are other 06 owners out there could you let me know what you are getting for milage.
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- #386 of 391
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Re: bad fuel milag 06 6.6 disel [06hdgmc]
by dmax06
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Jul 21, 2009 (7:03 am)
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Replying to: 06hdgmc (Jul 12, 2009 12:30 pm)
I bought my 06 Chevy Duramax (2500HD) last May w/ 27K miles on it. I run approx 80 miles a day mixed driving (maybe 65/35 hwy/city). I get 20-21 daily driving, sometimes high 21's. In winter it drops to 19-20. Have not done a pure road trip with it yet. I run stock exhaust, stock air intake, Shell Rotella 5W40 full synthetic, and PowerService fuel additive. I just swapped out the factory tires at 56K and don't know yet what effect that will have. Good Luck!
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