long term mpg testing on 6 manual - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 21 (permalink) Old 04-08-2008, 01:40 AM Thread Starter
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long term mpg testing on 6 manual

Ok , I did a nice compilation of 2 different mpg over a month period and the results are always the same(by hand) . Same highway, same distance, and+or- same weather. And the trucking rule I`ve learn over time looks like to be the same with the 6.7. First, 1950rpm(+-65mph) gives me 18.7 to 19.2 mpg and secondo, 2200rpm(+-72mph) is 14.7 to 16.2mpg. Results are always the same over a month. The 18 wheeler rule we use is from 55mph every 5mph faster is 10% more fuel+-. The test is done on a 07 6.7 manual quad 4X4 long bed. So.....slow down I guess : Sorry I always use rpm as a reference....trucker`s way to do it!
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post #2 of 21 (permalink) Old 04-08-2008, 05:46 PM
 
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I've tested mine over the past 2 months in the same conditions as yours. I have a 6.7 2007.5 4x4 quad short bed with manual 6. I run the same 1950rpm at 65mph and get 20-22mpg. when I go any higher than 65 I slowly loose mpg. At 70mph 18mpg is the max, and at 75 I get 16. If I go 60mph i still get the 19-20 mpg but nothing over. I don't do any of mine by hand though, just goin by the overhead. The numbers are always consistent though. weather is consistent too. little to no wind mind you.
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post #3 of 21 (permalink) Old 04-08-2008, 06:39 PM
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The auto with 3:73 @ 1950 RPM is 72+...I think? Mileage at that speed/rpm is not very good for the autos. I wonder if it has something to do with resistance at 70+ mph?
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post #4 of 21 (permalink) Old 04-08-2008, 10:16 PM Thread Starter
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Quote:
Originally Posted by Rich
The auto with 3:73 @ 1950 RPM is 72+...I think? Mileage at that speed/rpm is not very good for the autos. I wonder if it has something to do with resistance at 70+ mph?

probaly resistance for sure, and the rpm at 65 must real low on the auto?
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post #5 of 21 (permalink) Old 04-08-2008, 10:18 PM Thread Starter
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Quote:
Originally Posted by Fat Kid
I've tested mine over the past 2 months in the same conditions as yours. I have a 6.7 2007.5 4x4 quad short bed with manual 6. I run the same 1950rpm at 65mph and get 20-22mpg. when I go any higher than 65 I slowly loose mpg. At 70mph 18mpg is the max, and at 75 I get 16. If I go 60mph i still get the 19-20 mpg but nothing over. I don't do any of mine by hand though, just goin by the overhead. The numbers are always consistent though. weather is consistent too. little to no wind mind you.

Wow, that nice, any delete kit and how many miles on your truck?
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post #6 of 21 (permalink) Old 04-08-2008, 11:28 PM
 
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No mods as of yet. Just rolling over 17600. I'm waiting to see if there is any other problems or flashes. I'm waiting to hear back from H&S to see if it really matters if I dont have the edge w/ att in order to run the delete, and if there aren't any problems then I will be getting the kit. Then I will be looking to get an S&B intake not long after. If I have to run the edge then I will wait alot longer till I get the delete. That good ole warranty!
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post #7 of 21 (permalink) Old 04-09-2008, 12:33 AM
 
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hey fat kid you do know dpf delete voids warrenty also. probably more so than the edge. dealer showed me where and how to plug edge in. also how to unplug. lol. maybe you do know, but the way i just read it you won't do the delete if you need edge because of warrenty issues. anyway i don't really think you have to have edge juice, but it is the only programmer to clear codes automatically before startup. insight will clear codes, but manually. waiting for code free dpf delete is what i think i'm going to do. it sucks, but should be worth the wait.
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post #8 of 21 (permalink) Old 04-09-2008, 03:06 AM
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70 = 1700 ish RPM and 1900 = 75 on my auto.
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post #9 of 21 (permalink) Old 04-10-2008, 02:00 AM Thread Starter
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Thanks I always like to know these things :Thumbup:
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post #10 of 21 (permalink) Old 04-15-2008, 12:45 PM
 
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From Rich "70 = 1700 ish RPM and 1900 = 75 on my auto"
I have a 3:73 rear 2008 CTD MegaCab and it's getting his numbers also for it's 1st 509 miles. Was expecting better than 15.8mpg hand calc though with the overhead showing 18-20 almost as a constant.
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