podwerkz Posted October 5, 2020 Report Share Posted October 5, 2020 (edited) On level pavement is one thing, but with the axles articulating up and down over un-even terrain, it is common for a tire to contact a fender if the suspension airbags have been dumped. There are other risks as well. One time, articulating over some un-even hard packed dirt at a truck stop in Roswell, I bent a fuel tap on the bottom of a low-hanging fuel tank when the fitting scraped on the ground. Of course I was fully loaded. Luckily there were no fuel leaks. Edited October 5, 2020 by podwerkz Quote Nothing to see here. Link to comment Share on other sites More sharing options...
Parrformance Posted October 5, 2020 Report Share Posted October 5, 2020 Thank you for the reply, I want to keep learning. Quote 2006 Volvo VNL 780, " Arvey" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift 2003 Jeep Wrangler Rubicon 2010 Forest River Coachman Freedom Express 280RLS Jackalopee Link to comment Share on other sites More sharing options...
trimster Posted October 20, 2020 Author Report Share Posted October 20, 2020 So, just about home. Traveled about 1000 miles. Average mpg.... 4.7 Ouch! Maybe detuning this baby to 425hp? Quote Robert & Lisa '14 Keystone Fuzion 315 38' 5er 2015 Volvo VNL 670, D13, iShift 'The Tartis' (ours) 2013 Smart Fortwo Passion 'K-9' 2011 CanAm Spyder RT Limited (Ours) We are both USAF vets. Link to comment Share on other sites More sharing options...
Star Dreamer Posted October 20, 2020 Report Share Posted October 20, 2020 4 minutes ago, trimster said: So, just about home. Traveled about 1000 miles. Average mpg.... 4.7 Ouch! Maybe detuning this baby to 425hp? If you were heading east it could have been the winds, we averaged only 5.75 from Oklahoma thru Kansas and partway thru Missouri and we had heavy cross and head winds all three of our travel days. I think it was the worst I have seen in 8 years with our HDT. Quote 2005 Freightliner Century S/T, Singled, Air ride ET Jr. hitch 2019 46'+ Dune Sport Man Cave custom 5th wheel toy hauler Owner of the 1978 Custom Van "Star Dreamer" which might be seen at a local car show near you! Check out http://www.hhrvresource.com/ for much more info on HDT's. Link to comment Share on other sites More sharing options...
trimster Posted October 20, 2020 Author Report Share Posted October 20, 2020 I'm sure 3.08 rear end gears aren't helping. We do seem to migrate in and around mountains. So passes and windy roads. Quote Robert & Lisa '14 Keystone Fuzion 315 38' 5er 2015 Volvo VNL 670, D13, iShift 'The Tartis' (ours) 2013 Smart Fortwo Passion 'K-9' 2011 CanAm Spyder RT Limited (Ours) We are both USAF vets. Link to comment Share on other sites More sharing options...
Darryl&Rita Posted October 20, 2020 Report Share Posted October 20, 2020 1 hour ago, trimster said: So, just about home. Traveled about 1000 miles. Average mpg.... 4.7 Ouch! Maybe detuning this baby to 425hp? Was the mileage calculated or from the display? Our truck only has instantaneous, or lifetime average. If I want trip mileage, I have to calculate it. Detuning will definitely help, but if you drive by the boost gauge, you can maximize your mileage, and still keep the higher HP for just in case times. I think you have an OD iShift, so 3.08 shouldn't be hurting you any. Assuming you can keep it in OD, as much as possible. I don't worry too much about day mileage, or even trip mileage, as it typically averages out. Quote I have been wrong before, I'll probably be wrong again. 2000 Kenworth T 2000 w/N-14 and 10 speed Gen1 Autoshift, deck built by Star Fabrication 2006 smart fourtwo cdi cabriolet 2007 32.5' Fleetwood QuantumPlease e-mail us here. Link to comment Share on other sites More sharing options...
trimster Posted October 20, 2020 Author Report Share Posted October 20, 2020 Our dash computer allows for lifetime (I think) and re-settable trip information. It had 160k worth of commercial use MPG (3.7mpg with a lot of idling). I reset that, so the numbers it comes up with are 'my miles'. I let the trans pick the gears unless I'm tired of 800-1000 rpm lugging up a hill, then I down shift a gear and pick the rpms up to around 1300. We cruze at 65-70 mph on the flats. No rush up mountains but the truck can easily pull stiff grades at 55. The computer gives me a percentage of time in the sweet zone for mpg. Seems I'm there 90% of the time. Rolling out of Cortez today to Helper, Utah, then on to Salt Lake. Quote Robert & Lisa '14 Keystone Fuzion 315 38' 5er 2015 Volvo VNL 670, D13, iShift 'The Tartis' (ours) 2013 Smart Fortwo Passion 'K-9' 2011 CanAm Spyder RT Limited (Ours) We are both USAF vets. Link to comment Share on other sites More sharing options...
geodog1 Posted October 21, 2020 Report Share Posted October 21, 2020 My feeling about mpg: I enjoy the ride and feel that if I need to worry about fuel usage, I don't need to be doing this lifestyle. ShortyO Quote Link to comment Share on other sites More sharing options...
trimster Posted October 21, 2020 Author Report Share Posted October 21, 2020 Good point. Agree. Planning next outing now.... Quote Robert & Lisa '14 Keystone Fuzion 315 38' 5er 2015 Volvo VNL 670, D13, iShift 'The Tartis' (ours) 2013 Smart Fortwo Passion 'K-9' 2011 CanAm Spyder RT Limited (Ours) We are both USAF vets. Link to comment Share on other sites More sharing options...
dblr Posted October 21, 2020 Report Share Posted October 21, 2020 When I am asked what my mileage is I nicely state I did not buy the truck for mileage I did it for safety and comfort. Quote 2017 River Stone Legacy 38MB 2001 T2000 Kenworth 2009 Smart Passion ET Junior hitch Link to comment Share on other sites More sharing options...
Randyretired Posted October 21, 2020 Report Share Posted October 21, 2020 On 10/19/2020 at 7:59 PM, trimster said: So, just about home. Traveled about 1000 miles. Average mpg.... 4.7 Ouch! Maybe detuning this baby to 425hp? I get about 8mpg unless in the mountains then close to 7. Ours is an older 2001 Volvo with an ISX set at 500hp. That is with the Subaru, RZR and Teton. I cruise about 62 to 65 at about 1500 rpm. It seems like your rig should do a little better than what it is? Quote Randy 2001 Volvo VNL 42 Cummins ISX Autoshift Link to comment Share on other sites More sharing options...
trimster Posted October 22, 2020 Author Report Share Posted October 22, 2020 Cruzin today... 70 mph at 1300 rpms in 12th gear. Quote Robert & Lisa '14 Keystone Fuzion 315 38' 5er 2015 Volvo VNL 670, D13, iShift 'The Tartis' (ours) 2013 Smart Fortwo Passion 'K-9' 2011 CanAm Spyder RT Limited (Ours) We are both USAF vets. Link to comment Share on other sites More sharing options...
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