Talldog
01-23-2009, 09:28 AM
Drive your LMM around town locked in 4th,on the road in 5th. Compare mileage----Mine changed drastictly !!
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unit 01-23-2009, 01:17 PM Changed for better or for worse? Schweinmesser 01-23-2009, 01:39 PM What's the change???? Talldog 01-23-2009, 01:44 PM I've tried this for a week. Intown before 13-- after 15--- On the road,under 60, before 16----after 17.5. Go figure !!!!!!!! JIMMMY 01-23-2009, 01:51 PM Sounds like the post that said run it in Tow/Haul mode all the time for better MPG....... Yea right.......... Sucker born every minute....... :) Talldog 01-23-2009, 02:35 PM Hey Jimmy--- Have you tried it ????????? JIMMMY 01-23-2009, 02:59 PM Hey Jimmy--- Have you tried it ????????? !!!!!!!! minnesotaroofin 01-23-2009, 10:17 PM funny you bring this up the other day i noticed the same thing i put in in 5th before passing a car so it would not have so much drop and lag i forgot to put in back into drive and drove it a good 35 miles at 60 i just filled up and reset - i looked down and saw 19.1 and freaked - i reset and drove back in drive same route at same speed i was down to 17.8 -- 60 all the way - I do have bigger tires gets better mileage at 1800 rpm doing 60 than 1500 rpm doing 60 duramaxfan 01-24-2009, 02:29 AM Doesn't regen when in manual mode ???? Drive too long like that and you might get a "clean DPF now" message?? Runaway 01-24-2009, 09:44 AM Doesn't regen when in manual mode ???? Drive too long like that and you might get a "clean DPF now" message?? I would tend to disagree on this one! I think the truck is lugging more in 6th gear @ 60 than in 5th. When in 5th @ lower speeds the engine wouldn't be working as hard. Kinda like overheating and drop a gear and the engine then cools down, even though it is running at a higher RPM. JIMMMY 01-24-2009, 10:24 AM Peak torque is 1600 RPM and should be most efficient there, which is 60 MPH in 6th on my rig. wildcatbrownhound 01-24-2009, 11:17 AM I've tried this for a week. Intown before 13-- after 15--- On the road,under 60, before 16----after 17.5. Go figure !!!!!!!! :confuzeldI dont know why anyone would do this. Why not buy a man.tranny. At 10,000 miles I get 16 mpg towing a 3500 pound loaded lawnmower trailer: 14 mpg on a 12,000 pound.5er: 21mpg solo. All at 65mph. That is on paper. Not on AMG on the DIC. This is pretty good on a 6.6 liter diesel. But it is yours. Drive it like you chose. Go Figure. :confuzeld T.Myers 01-25-2009, 10:37 AM The only time I noticed better mpg locked in 5th gear is when I am pulling a 8K + size load. Then it helps my mileage a lot! dmaxboy08 01-25-2009, 11:44 AM also it has alot to do with 5th gear being "direct drive"...just my 2 cents big truck big power 01-25-2009, 11:57 AM 4th is 1:1 5th is .71:1 6th is .61:1 dozerboy 01-25-2009, 04:32 PM With 33s or smaller your not lugging the engine in 6th. There are a few long city street here that you can hit every light at 45-50 mph and I get better MPG taking those roads in 6th then 5th. Watching your boost and pyro will tell how to drive to get the best mileage. dmaxboy08 01-29-2009, 09:40 PM 4th is 1:1 5th is .71:1 6th is .61:1 sorry thought 5th would be direct drive in a 6 speed...but 4th is direct drive so the input shaft is turning at the same speed at the output shaft | ||