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Diesel Fuel Economy and chips

391 messages,  Last post on Oct 28, 2009 at 4:28 AM

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What is this discussion about? Ford F-250 Super Duty, Chevrolet Silverado 2500HD, Dodge Ram Pickup 2500, Ford F-350 Super Duty, Chevrolet Silverado 3500, Dodge Ram Pickup 3500, GMC Sierra 2500HD, GMC Sierra 3500, Fuel System, Performance Mods, Fuel System, Diesel, Fuel Efficiency (MPG), Truck

#162 of 391 Re: Diesel Idling [wgreen4] by elias Jun 27, 2006 (6:53 am)
Replying to: wgreen4 (Jun 23, 2006 5:06 am) Bill, i see lots of gasser drivers doing this too. i think it's absurd and that indicates fuel prices are not high enough. diesel drivers have a better justification for doing it in very cold weather however due to difficulty in very-cold-starts. but i see them doing it in warm weather too. mostly i think it's diesel-drivers who want to pretend they are driving big-rigs! i see VW TDI drivers doing it too! for each vehicle there is a tradeoff point where it makes sense to turn off the engine - for a certain duration of parking. i understand that for gassers that tradeoff point is less than one minute of parking. for diesel 4x4s perhaps the tradeoff point is a bit longer - a couple minutes maybe?
#163 of 391 Re: NEED SERIOUS HELP W/ HORRIBLE WIRING AND FUEL ECONOMY? [opester] by zrtpilot Jul 01, 2006 (5:29 pm)
Replying to: opester (Jun 22, 2006 12:33 pm) I can't help you with the wireing issue, but with my 01 dmax i averaged 12-14 city 16-17 hiway befor tunner. I have a Bullydog Triple Dog Tunner. Mileage went up 4.8 mpg Towing or empty.I was hauling 12k travel trailers for FEMA last October. Did 10k in 2 weeks. Two trips without chip 8.9 at 75 empty coming home 15.1 at 80. 4 runs with tunner 13.9 at 75, 19.9 at 80 on a truck with 135k on it. I have 8k on my new 06 and just loaded the 06 updates. Already picked up 2.5 on only 1/2 tank of fuel. It sounds like something wrong with your programmer. Best thing about the Triple Dog is once you buy it it will work on any dodge,ford or dmax.Just get on their web site and download their updates for the different truck. Hope this helps.
#164 of 391 Re: Dodge Ram Diesel Chip Actual Experience [taxspeaker] by dfh10 Jul 04, 2006 (1:31 pm)
Replying to: taxspeaker (Oct 02, 2005 9:44 am) Please reply with what kind of chip you have and any other info you feel would be helpfull.. I have a 2006 RAM 2500 with cummins turbo diesel. I get 14-14.5 city and pulling a boat 18-19 on the highway at 65mph.. Thanks Dave dfh10sbcglobal.net Replies to this message: taxspeaker (Jul 14, 2006 5:49 pm)
#165 of 391 Re: Dodge Ram Diesel Chip Actual Experience [dfh10] by taxspeaker Jul 14, 2006 (5:49 pm)
Replying to: dfh10 (Jul 04, 2006 1:31 pm) We were using the Edge chip. Over the winter all of a sudden it caused the engine to act like I had a bad tank of fuel-decreasing power, cutting out, finally stopped running. I removed the chip, had the dealer reset the air flow to standard and have not had another problem, nor have I re-installed the chip.   I am now considering a different module-truck now has 62,000 miles, mileage is 19.2 overall, but that isnt good enough
#167 of 391 Re: Not all the same [frankoduramax] by jim314 Jul 30, 2006 (4:05 pm)
Replying to: frankoduramax (Apr 10, 2006 8:59 pm) If one changes to lager diameter tires and does not recalibrate the speedometer/odometer then the vehicle is actually travelling faster and farther than the gauges indicate. So the true mpg would be greater than what the uncorrected odometer would give.
#168 of 391 Help w/ poor fuel economy 2006 cummins diesel by dwd Aug 20, 2006 (10:20 am)
I have a 2006, quad cab 4x4 3500 Cummins diesel, with 315 off-road tire. I have been getting poor fuel economy from day one, 12.5-14.5. Most of my driving is highway driving in the Texas hillcountry. I started using a superchip flashpag re-programmer after about 6,000 miles. Once I started using the re-programmer I started checking the actual mileage, from gallons to fill up/miles on odometer, vs the mileage the onboard overhead computer is telling me i am getting. I found that the mileage the computer was telling me was vastly different from what i actually measured. Using the superchip "Performance" program the computer would tell me I was getting 22-24mpg on the highway and 20-21 average around the ranch, highway. I was actually getting 15-16 average. The superchip programmer lets you adjust for the larger tire size so assuming this works the speedometer and odometer should be adjusted for the larger tire size. I recently went on a long highway trip from central Texas to Colorado Springs. I checked the mileage at every stop and was consciously keeping my speed under 70 in an effort to maximize my fuel economy. I had the computer set to the Superchip performance program. Same results, the onboard computer said I was getting 22 mpg but the measured mpg was never better than 16, usually 15 or so. I have recently set the truck back to the stock program. The computer tells me I am getting 15 mpg or so but I am actually getting 12.5 mph or so. I don't have a lot of confidence that the dealer will be motivated to find the cause of my poor fuel economy. Any help, insight or suggestions will be appreciated. dwd Replies to this message: jim314 (Aug 20, 2006 11:15 am) kcram (Aug 20, 2006 4:13 pm) dwd (Aug 20, 2006 4:30 pm) and 4 more... dwd (Aug 20, 2006 4:24 pm)
#169 of 391 Re: Help w/ poor fuel economy 2006 cummins diesel [dwd] by jim314 Aug 20, 2006 (11:15 am)
Replying to: dwd (Aug 20, 2006 10:20 am) Exactly what is the mfgr and model of this truck? What EPA est mileage city/hwy was on the window sticker? Did the 315 tire come stock? What is the full spec on the 315 tire and the stock tire if different? For example 315/75-18. An off road tire is almost certainly going to have higher rolling resistance than a tire optimized for pavement. The stated EPA estimates may be with a tire with much lower rolling resistance.   Have you checked the accuracy of your odometer? You can use marked off highway segments or use Google or Yahoo map distances and compare. Does your speedometer agree with the unmanned radar installations, "Your vehicle speed is ____."?   I have heard people disparage the accuracy of vehicle computers. The only vehicle I have checked is a 2001 Jeep Grand Cherokee Ltd. with 4L I-6 gas engine belonging to a relative. On a trip I found that my calculation from odo and fuel added at the pump agreed extremely closely with the computer average. Replies to this message: kcram (Aug 20, 2006 4:13 pm) dwd (Aug 20, 2006 4:30 pm) jim314 (Aug 21, 2006 4:00 am) and 1 more... bsouth (Aug 31, 2006 8:27 am) and 1 more... dwd (Aug 20, 2006 4:24 pm)
#170 of 391 Re: Help w/ poor fuel economy 2006 cummins diesel [jim314] by kcram HOST Aug 20, 2006 (4:13 pm)
Replying to: jim314 (Aug 20, 2006 11:15 am) dwd has a Dodge Ram - only brand that offers the Cummins diesel. No truck with a GVWR over 8500 pounds is rated by the EPA.   dwd, you're probably not going to get much better mileage than you have achieved. My 05 Cummins is consistently 10-15% worse than my 96 Cummins was. Plus, those 315s have raised your unsprung weight and rolling resistance substantially and you're using extra horses to get that rubber moving.   With my 05 (3500 Quad 4x4 dually), the only way I can clear 20 mpg is at a steady 52 mph.   kcram - Pickups Host Replies to this message: dwd (Aug 20, 2006 4:30 pm) jim314 (Aug 21, 2006 4:00 am) dwd (Aug 25, 2006 7:59 pm) bsouth (Aug 31, 2006 8:27 am)
#171 of 391 Re: Help w/ poor fuel economy 2006 cummins diesel [jim314] by dwd Aug 20, 2006 (4:24 pm)
Replying to: jim314 (Aug 20, 2006 11:15 am) The truck is a 2006 Dodge 3500 Quad Cab 4x4. I don't believe that they put EPA est mileage on super duty trucks. The tires are BF Goodrich 315/70/17 all terrain tires, they were not stock. the stock tires were 265/70/17. I have checked the odometer with roadside mile markers, it appears to right on. Same with the speedometer. I figured the tires would drop my fuel economy some but I didn't think I would go from the expected 19mpg to 13. Still can't figure out the computer thing, it is way off.

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