New World Record! 112 mpg 1,456 miles/tank!

Well, no, she's probably "staying out of the battery", as the
the hypermilers phrase it, and DWB [look it up at www.cleanmpg.com].
I'd be interested in a translation of that whole xrea.com thread,
none of which the usual translators appear able to handle, to see
what major things she pays attention to while driving. Everyone
learned about P&G from the Pittsburgh marathon, now maybe all that
can be taken to the next level.
.
_H*

 

<div class='quotetop'>QUOTE(hobbit @ Aug 17 2006, 06:09 PM) [snapback]304915[/snapback]</div>

She says in her last post (posted 8/17 Japan time) that she intends to post more details soon.

Interesting that she wasn't even trying to set any mileage records in particular....


Ken

 

<div class='quotetop'>QUOTE(efusco @ Aug 18 2006, 09:25 AM) [snapback]305269[/snapback]</div>

I'd really like to know if the car-leaf icons represent all energy poured into the battery or only kinetic energy poured into the battery while braking or coasting (with the engine off). If these 50 Wh icons represent all energy poured into the battery (including from the engine, when the engine is operating under a light load), then it seems that she minimizes arrows going to (and from) the battery.

Was she dead-banding (pulsing the engine with little to no energy flowing to or from the battery) or was she using Dr. Fusco's more traffic friendly prescription of mildly charging the battery during pulses and drawing a little energy from the battery while 'gliding'?

 

<div class='quotetop'>QUOTE(ken1784 @ Aug 18 2006, 05:14 AM) [snapback]305218[/snapback]</div>

It also seems to demonstrate that she is not actively using the hybrid system, except to easily restart the car. For extreme hypermiling under such kind conditions, it seems that one might do better without the weight of a full hybrid system.

If Toyota made a 'Prius' with no hybrid system but with the Atkinson engine, the low resistance design, and a manual transmission, I wonder what hypermilers could achieve. They might have to manually turn off the engine at the end of a pulse and may choose to bump start the engine at the end of a glide by engaging the clutch (just like the original pulse and glide before the Prius). I suspect real world mileage would suffer with traffic and braking. I also suspect that record braking hypermiling performance under ideal conditions would improve.

 

<div class='quotetop'>QUOTE(theorist @ Aug 18 2006, 10:33 AM) [snapback]305423[/snapback]</div>

The leaf icons are only from regenerated power not energy supplied by the engine from MG1.

50wH is enough to propel the card about 1/4 mile, although the efficiency from mechanical -> electrical -> chemical -> electrical -> mechanical is much less than 50% so it is best to try to avoid it altogether.

kevin

 

<div class='quotetop'>QUOTE(efusco @ Aug 18 2006, 02:24 PM) [snapback]305458[/snapback]</div>

So true.

I often laugh when people say that a Prius has to be driven differently to get good gas mileage. In my mind the benefit of the hybrid system is that it enables the driver to get good mileage while driving normally. The hypermiling techniques bring the biggest payoff in conventional vehicles in which 0% of braking energy is captured, more aggressive pulse and gliding is more necessary to keep the engine operating at efficient loads, and more fuel is being used and could potentially be conserved. Using hypermiling techniques to decrease fuel consumption from 20mpg to 40mpg would save more than twice as much fuel as would using hypermiling techniques to go from 50mpg to 100mpg.

I find pushing the fuel performance envelope in any car is fun, educational, and inspiring.

 

<div class='quotetop'>QUOTE(ken1784 @ Aug 18 2006, 02:50 PM) [snapback]305477[/snapback]</div>

Thank you TWICE, Ken, for the references to the new record and to that excellent presentation with a wealth of information, including Atkinson engine maps . I hadn't imagined that the PSD serving as an eCVT could be more efficient than a good manual transmission. I remembered Kevin17 stating elsewhere in a thread on series hybrids that the mechanical -> electrical -> mechanical losses were large (%20) compared to fixed ratio gears (%5).

 

Non-hybrid hypermiling is happening all the time. Go read it
straight from the people DOING it every day, over at
http://www.cleanmpg.com/forums/ and you are most heartily
encouraged to sign up and join the fray. Much good info.
.
My own bit of "non-hybrid" experimenting can be read in detail at
http://www.cleanmpg.com/forums/showthread.php?t=1302
.
Green car icons are ONLY from regen. For those who haven't read
it N times before, it's about the amount of energy you would expend
by PUSHING the non-powered car around a parking lot vigorously for
about 12-15 minutes while someone else steered. If you could keep
that up for an hour [4 green cars?] you might be able to get a mile.
.
_H*

 

<div class='quotetop'>QUOTE(ken1784 @ Aug 19 2006, 03:37 AM) [snapback]305791[/snapback]</div>

Wow! Thanks for the update! If only my commute were that clean, clear, and under control...

 

<div class='quotetop'>QUOTE(ken1784 @ Aug 16 2006, 06:22 PM) [snapback]304415[/snapback]</div>

Wouldn't this lead to inaccuracies in the mileage? For every revolution of the wheels, the car will have travelled less than it thinks it has, which would lead to inflated MPG calculations. Or am I missing something?

 

<div class='quotetop'>QUOTE(JasonQG @ Aug 20 2006, 05:28 PM) [snapback]306359[/snapback]</div>

The rolling circumference of the 185/65-15 and the 195/55-16 tires are nearly identical. The tiresize hasn't thrown anything off. Of course using fully worn tires as opposed to new tires can make a 2% difference in the measured distance traveled. Worn tires will increase true fuel efficiency due to lower rolling resistance and then increase measured fuel efficiency a bit more due to the smaller rolling circumference.

 

<div class='quotetop'>QUOTE(Green Speed @ Aug 16 2006, 04:27 PM) [snapback]304307[/snapback]</div>

a high of 38.1 here!!!!