[AT] Ram fuel mileage

[Spencer Yost]

Thanks for the clarification.  I thought the urea was for the DPT and urea was somehow burned during regen.   I did not realize it was NOx reduction instead of the detune.

I average 44mpg in the winter, and 47mpg in the summer (fill-up calculations - not computer) with my VW golf diesel.   I can't imagine Exhaust Fluid raising it much more than 3% and am very glad I have a spare and no exhaust fluid.

BTW:  Am I the only one who think exhaust fluid sounds like the old "blinker fluid level" joke?  (-:

Spencer

Sent from my iPhone

> On Jun 13, 2014, at 10:36, Stephen Offiler <soffiler at gmail.com> wrote:
> 
> Most of the diesels available new in the USA are using DEF (that is Diesel
> Exhaust Fluid and is the common name for the urea that Spencer mentioned).
> There are some exceptions in the VW TDI lineup.  It's all a matter of
> meeting the US emissions specifications.  If they can tune (or detune) the
> engine to meet emissions without DEF, then they might choose that route.
> For example, VW detunes the Jetta TDI and omits DEF, resulting in slightly
> lower fuel economy versus the Passat TDI which does use DEF.
> 
> DEF controls oxides of nitrogen, not particulates.
> http://en.wikipedia.org/wiki/Diesel_exhaust_fluid
> 
> Yes, the new Ram Ecodiesel engine requires DEF.  Ram claims 11 gallons per
> 10,000 miles which is 909 miles per gallon DEF. Some Internet forum
> discussion reports actual consumption rates slightly above 1000 miles per
> gallon DEF.  1000 is a nice round number.  NAPA sells 2.5 gallon jugs for
> $14 (= $5.60 per gallon DEF) but it is starting to show up at gas stations
> for reportedly as little as $3 per gallon DEF. Let's just call it a nice
> round $5 per gallon.  That's an additional expense of $5 per 1000 miles on
> top of fuel cost.  At 25 MPG and $4 per gallon for fuel, it costs $160 for
> fuel to drive 1000 miles, so just make that $165.  If you were to think of
> DEF like some sort of fuel surcharge, it works out to 3%.
> 
> As a side-note, particulates are controlled with a Diesel Particulate
> Filter (DPF) which is built sort of like a catalytic converter but it
> doesn't do any catalyzing.  It traps the particles and then periodically
> heats WAY up (650C plus, which is 1200F plus) to burn the collected
> particles down to ash.  This is called DPF Regeneration.  It will happen
> naturally if you drive hard enough to get it that hot; otherwise it will be
> forced to happen periodically (about every 500-1000 miles) by injection of
> extra fuel.
> 
> SO
> 
> 
> 
> 
> 
>> On Fri, Jun 13, 2014 at 9:08 AM, Spencer Yost <yostsw at atis.net> wrote:
>> 
>> One side note.  The diesel they build for the Chevy Cruz American market
>> uses urea injection for particulate control.    The urea tank is just
>> another tank to fill and eliminates the spare tire.   They give you a can
>> of fix-a-flat instead!
>> 
>> Not sure about about the larger engines.   I was only looking at cars.
>> In the end my wife decided to keep her VW diesel jetta (fuel is used for
>> particulate control) and run it into the ground.  Which is proving hard to
>> do (-:
>> 
>> Spencer
>> 
>> 
>> 
>> Sent from my iPhone
>> 
>>> On Jun 13, 2014, at 0:55, "Sewell, Steven" <sewell at ohio.edu> wrote:
>>> 
>>> Dennis keep us updated on the truck. The same diesel is an option in the
>> Jeep Grand Cherokee.  I've been looking at the Jeep for our "car"
>> replacement in the next year.
>>> 
>>> Steve Sewell
>>> Albany, Ohio USA
>>> sewell at ohio.edu
>>> sewell at atis.net
>>> ________________________________________
>>> From: at-bounces at lists.antique-tractor.com [
>> at-bounces at lists.antique-tractor.com] On Behalf Of Dennis Johnson [
>> moscowengnr at yahoo.com]
>>> Sent: Thursday, June 12, 2014 12:56 PM
>>> To: at at lists.antique-tractor.com
>>> Subject: [AT] Ram fuel mileage
>>> 
>>> All,
>>> The mileage numbers were calculated after entering gallons and miles
>> into a spreadsheet. I also did trip average for the long trips via
>> spreadsheet. I also do a running 3 tank average to check for incomplete
>> fill ups, etc.
>>> I do not have a good way to account for idle time, etc. truck records
>> idle vs drive time, but not sure exactly what to do with this other than
>> keep for general information.
>>> I am guessing the screen numbers on the dash are a little bit high, but
>> still impressed with the truck.
>>> Thanks
>>> Dennis
>>> 
>>> 
>>> Sent from my iPad
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