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Old 03-21-2015, 11:44 AM   #11
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our Mercedes MBE4000 is the equivalent of the detroit diesel dd 13 -
mercedes owns or at one time owned detroit diesel (not sure if they still own them)...basically theyre 12.8L intercooled turbo, in-line 6's.

we have a pre-emmissions (no egr cooler or urea injection) and while we don't have the iShift we do have the Meritor SmartShift 12 speed

the Meritor SmartShift is a 2 pedal automatic - it uses a conventional DRY CLUTCH (no torque converter) -
iirc at least some iShift's are 3 pedal - where you have to use the clutch to get going & stopping.

I love our smart shift - its very impressive just mash the throttle and it does all the rest -
it selects the starting gear (usually 3rd, but can be reprogramed to start higher or lower if you like....i keep saying I'm gonna have ours reprogramed to start in 5th).

the smart shift will SKIP shift based on several factors - throttle position, load etc....
usually the pattern is something like 3, 6, 7, 9, 10, 11, 12

downshifting is equally as impressive - it just works.

of course you can MANUALLY shift it w/ the paddle but that method does not allow for skipping any gears.

the best we've ever seen is slightly over 13 mpg in some mixed driving (interstate & secondary roads/light fog that prevented us from going over 60 mph) the worst we've ever seen (interstate wise) was 8.9 and that was due to my right foot and a lot of mountainous driving.

were very consistent in our 9.9 mpg achievement w/ the cruise control set at 72mph - i doubt you're gonna see anything better than that really and i have yet to meet a pusher owner that gets even that - and their motors are generally smaller w/ less horse (than our 450hp).
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Old 03-21-2015, 11:51 AM   #12
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I always go max capacity first and try to over GVW what I will need. The MPG just works out to whatever it is. If MPG is really a hot button......i don't think any of the big RVs make any sense imho. They all suck if you get any real weight on or behind them and you want to run with traffic.
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Old 03-21-2015, 11:58 AM   #13
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Quote:
Originally Posted by bushpilot View Post
our Mercedes MBE4000 is the equivalent of the detroit diesel dd 13 -
mercedes owns or at one time owned detroit diesel (not sure if they still own them)...basically theyre 12.8L intercooled turbo, in-line 6's.

we have a pre-emmissions (no egr cooler or urea injection) and while we don't have the iShift we do have the Meritor SmartShift 12 speed

the Meritor SmartShift is a 2 pedal automatic - it uses a conventional DRY CLUTCH (no torque converter) -
iirc at least some iShift's are 3 pedal - where you have to use the clutch to get going & stopping.

I love our smart shift - its very impressive just mash the throttle and it does all the rest -
it selects the starting gear (usually 3rd, but can be reprogramed to start higher or lower if you like....i keep saying I'm gonna have ours reprogramed to start in 5th).

the smart shift will SKIP shift based on several factors - throttle position, load etc....
usually the pattern is something like 3, 6, 7, 9, 10, 11, 12

downshifting is equally as impressive - it just works.

of course you can MANUALLY shift it w/ the paddle but that method does not allow for skipping any gears.

the best we've ever seen is slightly over 13 mpg in some mixed driving (interstate & secondary roads/light fog that prevented us from going over 60 mph) the worst we've ever seen (interstate wise) was 8.9 and that was due to my right foot and a lot of mountainous driving.

were very consistent in our 9.9 mpg achievement w/ the cruise control set at 72mph - i doubt you're gonna see anything better than that really and i have yet to meet a pusher owner that gets even that - and their motors are generally smaller w/ less horse (than our 450hp).
Don, how tall is your's? I'm 13'5" to my ac's. I am still blown away by your milage (which I think is freaking awesome!) If your true combined is 8.5mpg at an avg of 32k#'s and mine is 6 to 6.5mpg at a minimum of 50k#'s to 60k#'s. I guess it's not a big mystery.....more like common sense.
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Old 03-21-2015, 12:33 PM   #14
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Quote:
Originally Posted by THUNDERUSONE View Post
Don, how tall is your's? I'm 13'5" to my ac's. I am still blown away by your milage (which I think is freaking awesome!) If your true combined is 8.5mpg at an avg of 32k#'s and mine is 6 to 6.5mpg at a minimum of 50k#'s to 60k#'s. I guess it's not a big mystery.....more like common sense.
im not quite as tall as you are - iirc I'm 13'1 to the top of the air conditioners...
had to check my "stickers" to be certain & i may measure it again - just to confirm.



your 13'5" would make me nervous as hell - supposedly the max height (for tractor trailers) is 13'6" and I've been under some interstate bridges (on the oklahoma turnpike) that were 13'6"

My mpg is good - certainly puts me in a tolerable range when you consider what pickup trucks pulling 5er's can get.
if I'm really pushing it - hitting 80 (and towing the race car/trailer) the mpg can suffer into the high 7's or 8.0 mpg....the "round town" stuff kills us...we have a local state park we light to go to & that trip doesnt allow me to really get the coach rolling / stretching its legs...which sometimes puts us in (what i consider) dismal range of 6.5 mpg
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Old 03-21-2015, 01:50 PM   #15
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Quote:
Originally Posted by bushpilot View Post
our Mercedes MBE4000 is the equivalent of the detroit diesel dd 13 -
mercedes owns or at one time owned detroit diesel (not sure if they still own them)...basically theyre 12.8L intercooled turbo, in-line 6's.

we have a pre-emmissions (no egr cooler or urea injection) and while we don't have the iShift we do have the Meritor SmartShift 12 speed

the Meritor SmartShift is a 2 pedal automatic - it uses a conventional DRY CLUTCH (no torque converter) -
iirc at least some iShift's are 3 pedal - where you have to use the clutch to get going & stopping.

I love our smart shift - its very impressive just mash the throttle and it does all the rest -
it selects the starting gear (usually 3rd, but can be reprogramed to start higher or lower if you like....i keep saying I'm gonna have ours reprogramed to start in 5th).

the smart shift will SKIP shift based on several factors - throttle position, load etc....
usually the pattern is something like 3, 6, 7, 9, 10, 11, 12

downshifting is equally as impressive - it just works.

of course you can MANUALLY shift it w/ the paddle but that method does not allow for skipping any gears.

the best we've ever seen is slightly over 13 mpg in some mixed driving (interstate & secondary roads/light fog that prevented us from going over 60 mph) the worst we've ever seen (interstate wise) was 8.9 and that was due to my right foot and a lot of mountainous driving.

were very consistent in our 9.9 mpg achievement w/ the cruise control set at 72mph - i doubt you're gonna see anything better than that really and i have yet to meet a pusher owner that gets even that - and their motors are generally smaller w/ less horse (than our 450hp).
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Old 03-21-2015, 01:54 PM   #16
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Thanks Good Info.I didn't know how the Mercedes were holding up.Sounds they would be hard to beat.One more question is rear ratio?Should you get the tag axle or not?Thanks wmbillh.
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Old 03-21-2015, 02:02 PM   #17
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Most of the truck conversions I've seen with two rear axles have both of those as drive axles. I think Showhauler is just finishing up a build on one where they have a tag axle behind the drive axle. But that's the only one I've seen that way. If you build yours from scratch you would have the option to spec it any way you wanted. wmbillh, are you wondering if you should stay away from a twin screw (two drive axles)?
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Old 03-21-2015, 03:57 PM   #18
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Quote:
Originally Posted by wmbillh View Post
Thanks Good Info.I didn't know how the Mercedes were holding up.Sounds they would be hard to beat.One more question is rear ratio?
confused ??

sorry did mean to hi-jack your thread - just offering more info regarding the engines/trans. from what i can tell our MBE4000 is a mercedes only by the changed (logo) valve cover & a plastic cover on the side of the engine.

i forget what rear end gearing I've got, but id like to go slightly higher - just because i like to run faster (72 - 75 mph) than most (pusher owners)....and i could improve on the mpg if i could get the RPM under 1500 at 72mph



Quote:
Originally Posted by wmbillh View Post
Should you get the tag axle or not?Thanks wmbillh.
on coaches like ours there is no "tag" axle - (tags on are single tire'd per side & they can be lifted)....on our coaches BOTH axles are DRIVEN (full diff's and duel wheeled/tired on each side).

the nice thing about our 2nd axles are the fact that you can lock each diff independently AND you can lock both axles together (ala 4 wheel drive).

i would have preferred the 2nd (driven) axle - for the added safety (blow out/tires) and having another set of brakes would be really nice...and i love the idea of 4 wheel drive

I go to a fair amount of races & sometimes end up parking in grass....even if i got stock - a tow truck would still be cheaper than having to buy 4 more tires (at roughly 750 per tire or 3k per rear axle)

if i were towing a STACKER trailer or big boat (like john - THUNDERUSONE) then i would DEFINITELY want the 2nd axle..... iirc THUNDERUSONE coach is nearly 12k or 18k lbs heavier than ours.....not sure WHY that is...but at his weight i'd want the 2nd axle too !
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Old 03-21-2015, 04:56 PM   #19
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I am looking to full time rv or stay out for extended time.Looked at some consignment motorhomes this week.Some had low miles but the exteriors looked bad.I have researched the people convertind hdt into single axle and pulling fith wheel.Now Im on toterhomes.Mpg are better than I expected.Thanks.
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Old 03-21-2015, 10:33 PM   #20
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Okay, so you're thinking about pulling a camper trailer with an HDT then? That's a different deal.
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