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6.7 Liter Dodge Cummins 07.5-UP Discussion of 6.7 Liter Dodge Cummins Diesels

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  #1  
Old 10-11-2010, 08:35 PM
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Question Best RPM for Mileage

Earlier today I was noticing that I seemed to be getting better mpg at 17-1800 rpm vs a slower speed and 1600 rpm. Since I have the 6 sp auto should I just use 5th gear instead of 6th and will I get better mpg??
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  #2  
Old 10-16-2010, 10:23 PM
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I cant speak for your common rail.. but I can speak for every single other gas car, and my 2 diesel trucks and my diesel car.. with standard transmissions, running the rpms up (in a diesel) to about 2k or so, or longer on hills, is the best for mileage. Diesels do NOT like being short shifted.
What I've noticed with all of my autos though, is the lighter on the throttle, the better the mileage. Now keep in mind, every single car, truck and motor are different. But "typically", standards like more rpms, and autos like being shifted early.

I know that people with tdi Volkswagens get 70+miles per gallon leaving their cars in 4th gear on highway runs (Can you say 3500-4k rpms in a diesel?). Not good at ALL for the rotating assembly.. but great for mileage.
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Old 10-16-2010, 10:28 PM
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i get better in 6th gear around 1500 rpms

diesel pap's Sig:Dodge Cummins Electric Blue Mega Cab
AFE Intake, Smarty, Edge Juice W/Attitude(for gauges), Mighty Diesel Head Bolts, 5" Magnaflow, Royal Purple & Mag-Hytec Deep Tranny Pan

1997 Cummins 3500 Dually ~ AFPA 8000# Modified Street Diesel Class Points Champion for 2011 ~
~ AFPA 8000# Modified Street Diesel Class Points Champion for 2013 ~


& 1991 W250 Dually


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  #4  
Old 11-25-2010, 07:04 PM
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Keep above the 1600 .. closer to the 2000 if you are towing.
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  #5  
Old 11-26-2010, 08:18 AM
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I get the best around 75 mph, 1600-1700 or so. Best Ive done with my truck is 25.6 and thats with traffic jams on the way from MD to CT

DAFBFD58's Sig:2008 2500 Dodge ---- Silver 66, DDP90 Injectors, EGR Delete, AirDog2, Modded Cp3, Banks Intercooler, DPF Delete by IDP, Smarty Tuner, 20" KMC Rockstars-Nitto MTs
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  #6  
Old 12-02-2010, 09:19 PM
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what kind of mpg increase can i exspect with deletes , what power level is best on HS for mpg's, only getting 13.2 now on a good day

beerlvr's Sig:2008 3500 Quad Cab Dually, ISSPRO gauges, HS XRT PRO, HS OVERDRIVE , FLOW PRO 5" , EGR/ COOLER delete
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  #7  
Old 12-02-2010, 09:29 PM
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you fixin to be a very happy guy Beerlvr.

barkrulz's Sig:2008 Dodge Cummins MC 4X4: AFE Stage 2 dry filter, Mini Maxx (on single pod A pillar with handle), 5"turbo back exhaust no muff, egr/cooler delete, rail plug and ISSPRO EV2 rail and fuel gages overhead. Gotta get that tranny some help next.
Wifey in stock 2011 loaded Jetta TDI.
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  #8  
Old 12-03-2010, 04:18 PM
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When empty Im getting around 18-19 unless bad headwinds then its 14. Towing 34ft trailer 9-12.
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