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Old 08-13-2020, 11:03 AM   #81 (permalink)
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Quote:
Originally Posted by JSH View Post
Fuel economy and driver retention

JCP is a long-haul driver driving an automated manual. He gives some feedback in post #45. He said he is averaging 8.1 mpg.
There are those who were claiming 10-12mpg in times long since past.
Guessing slow roads And few stops.

OTRs theoretical is somewhere between 12-16 but the cost of labor is assumed to exceed the cost of fuel on that end of the spectrum

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Old 08-13-2020, 11:11 AM   #82 (permalink)
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Quote:
Originally Posted by rmay635703 View Post
There are those who were claiming 10-12mpg in times long since past.
Guessing slow roads And few stops.

OTRs theoretical is somewhere between 12-16 but the cost of labor is assumed to exceed the cost of fuel on that end of the spectrum
Also flat roads and in the middle of a convoy, possibly west to east direction
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Old 08-13-2020, 12:59 PM   #83 (permalink)
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Quote:
Originally Posted by rmay635703 View Post
There are those who were claiming 10-12mpg in times long since past.
Guessing slow roads And few stops.

OTRs theoretical is somewhere between 12-16 but the cost of labor is assumed to exceed the cost of fuel on that end of the spectrum
Fuel economy is highly dependent on terrain, traffic, type of trailer and CGVW. I don't believe anyone saying they were getting 10-12 mpg hauling a full load decades ago.

Coast to Coast (East to West) the Freightliner New Cascadia did 10 mpg at 76,000 CGVW. The older Cascadia Evolution did 9 mpg on the same trip.


The Super Truck 1 (2015) did 12.2 mpg @ 65,000 lbs CGVW driving 65 mph on a interstate trip in Texas. That truck included a lot of impractical tech from a cost / benefit perspective. That is what happens when you have a $80 million project to produce one truck. However, some of the tech carried over to production vehicles.

It will be interesting to see what Super Truck 2 does in 2021
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Old 08-14-2020, 01:34 AM   #84 (permalink)
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Originally Posted by JSH View Post
Fleets are all about cost per mile and they would not be paying extra for an automated manual if it was costing them fuel economy.
Besides fuel economy, another aspect to consider is maintenance cost. Allison claims its 3000-Series automatic transmissions have a lower maintenance cost even than manuals on urban transit buses, all while also decreasing brake wear and providing a fuel economy around 4% higher than a manual.
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Old 08-14-2020, 03:00 AM   #85 (permalink)
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Today I leaned that Chrysler has had an Autostick transmission. I knew about the VW Autostick — vacuum operated three speed with a torque converter — but I was always leery of it because my parents had a Rambler station wagon with something similar that kept breaking a connection in the column shifter.

https://en.wikipedia.org/wiki/Autostick
Quote:
System advantages
Ability to manually select gears
Ability to start from 2nd or 3rd in inclement weather to improve traction
Allows downshifting while coming down steep inclines to maintain speed
Improved performance with quicker, more firm shifts
Removes clutching with pedal, instead it is operated by hand
Apparently 'overdrive' is just 4th gear.
Quote:
The service manual explains that Autostick signalling is multiplexed on a single wire. The transmission control module outputs a 5v signal to the handle and monitors it for voltage drop The voltage ranges 0.3-1.6,1.6-2.8, 2.8-3.8, and 3.8-4.8 representing down, up, overdrive lockout, and all open respectively.
So it seems like one could wire paddle shifters paddles behind the steering wheel (down left/up right) and replace or override the lever shifter.

Does anyone have this transmission? Is it any good for pulse and glide hypermiling?
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Old 08-14-2020, 10:45 AM   #86 (permalink)
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The auto stick or the other? I had one in a squareback, much better than the 2 speed which had a clutch. It didn't coast, the engine was always engaged but could be modded easily. Kinda like driving a powerslush
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Old 08-14-2020, 11:52 AM   #87 (permalink)
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Besides fuel economy, another aspect to consider is maintenance cost. Allison claims its 3000-Series automatic transmissions have a lower maintenance cost even than manuals on urban transit buses, all while also decreasing brake wear and providing a fuel economy around 4% higher than a manual.
I guess that depends on what manual transmission Allison is using as a benchmark. If Allison is benchmarking a 4 or 5 speed manual they might be more efficient.

In the USA, the Allison 3000 series is popular for Class 6 medium duty trucks used for vocational applications. The Eaton manual option would be a Fuller 9-18 speed or Eaton Ultrashift automated manual. The Allison is the least fuel efficient option but the easiest to drive. (As one would expect from a 6 speed auto with a torque converter)

Last edited by JSH; 08-14-2020 at 04:14 PM..
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Old 08-14-2020, 12:41 PM   #88 (permalink)
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Quote:
Originally Posted by Piotrsko
The auto stick or the other? I had one in a squareback, much better than the 2 speed which had a clutch.
I was thinking about the Chrysler variant.

It uses electric solenoids instead of engine vacuum, appeared in a lot of Chrysler products, the PT Cruiser, Caravan, etc. Allegedly, there was a PT Cruiser GT that had the same engine as the Neon SRT-4 with an aluminum block.
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Old 08-14-2020, 01:49 PM   #89 (permalink)
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Quote:
Originally Posted by freebeard View Post
Apparently 'overdrive' is just 4th gear.
Overdrive reminds me of the 1985 Volvo I drove. It had a 4 (or was it 5?) speed manual with an overdrive switch on the shifter knob. Never knew what that actually did to reduce the RPMs, or why they didn't just add another gear.

I do know coming back from Canada without the overdrive made for a noisy and inefficient trip back.
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Old 08-14-2020, 04:09 PM   #90 (permalink)
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^ An uncle of mine had manual Volvos in that era, and I remember the overdrive switch on top of the shifter as well. I think he would press the clutch, then press the switch. Seems strange, doesn't it? I don't remember if he had to press it again to get out of OD.

Coincidentally, he also had a late 70's BMW 3 series, and was one of the first people to show me how to drive stick in that car (on my grandpa's 1/4 mile gravel farm laneway). I was suitably impressed. I don't know if he was!

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