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1 6th September 17:18
badger
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Posts: 1
Default Best fuel mileage, and reliability pickup diesel?


I searched these forums and can't find a decent thread talking about
fuel mileage and reliability.
I want to buy a used(150,000miles or so)DIESEL pickup, mainly because
I've always wanted one, and secondly for the fuel mileage and engine
life span. I won't be pulling a trailer, nor carry abnormally large
loads. I am a sales rep who is going to be driving a LOT more.
I am a big Ford fan but, I need a long lasting, good fuel mileage
Vehicle REGARDLESS of the brand. I hope I can get an OBJECTIVE opinion
from you guys.

Here is what I've come up with so far:
Dodge, worst mileage, best overall engine reliability.
Ford, better mileage, not as good reliability.
Chevy/GMC, best mileage, worst reliability.
These results are based on what I've read concerning 1983 and up
vehicles.
Keep in mind, I'm using brand generalities, not engine specifics. I'm
coming here to get opinions from you as to specific engine, axle,
combinations, and brands for my needs. PLEASE DON"T start arguments
with each other, I'm looking for ALL opinions and discussions.
FORD is my preference, but if Chevy is better for me, then Chevy it
is, or Dodge. All discussions are welcome, if TWO points are made,
your opinion of best mileage reliability, and best fuel economy. Keep
in mind, DIESEL info only.

Thanks,
Clay
PS. if you know of a site, which covers this in detail, I apologize in
advance and ask that you point me to it! Also, I have posted this on
other sites as well.


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2 6th September 17:19
franko
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Posts: 1
Default Best fuel mileage, and reliability pickup diesel?


Hello Badger,

Try http://www.62-65-dieselpage.com for GM diesel info. They also have a
discussion forum with very helpful members.

Franko
98 Tahoe 6.5TD 4x4, 160k miles (22mpg highway/16 local)
86 Suburban 6.2 NA 2WD, 165k miles (26 mpg highway/18 local)
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3 6th September 17:19
jonathan race
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Posts: 1
Default Best fuel mileage, and reliability pickup diesel?


I'm going to chime in with my personal opinion, just so long as you
recognize that it's just an opinion and not the gospel truth.

I think your list should read as follows, based on what experience I have
with my own trucks, trucks at work, and friend's trucks.

For diesel pick-ups with 150K+ miles/7-10 yrs old:

Dodge (I-6 5.9L ***mins Turbo Diesel, Intercooled, direct injection): Best
motor, best mileage, poor automatic transmission, good manual tranny.
Ford (V-8 7.3L Powerstroke turbo diesel, intercooled, direct injection): OK
motor, worst mileage, poor automatic tranny, Unk manual tranny.
Chevy (V-8 6.5L turbo diesel, non-intercooled, indirect injection): Motor
OK but not powerful (better after '97), middle of the road mileage, best
auto tranny, Unk manual tranny.

My friend still gets 23-24mpg on his 1989 Dodge with a manual tranny. I
used to get 20 mpg on my '95 Chevy 6.5L turbo diesel with the automatic, and
trucks at work (when we used to use Fords) got 13-14mpg at best with the
automatic tranny.

I hated the Ford E4OD automatic transmissions, and I heard the Dodge
automatics weren't much better. Funny how all the folks I know with Dodge
trucks of that generation all had sticks - something to do with the
automatic not being able to handle the torque of the ***mins 5.9L motor.
Chevy always had the best tranny's but the 6.5L wasn't the motor you wanted
if you wanted to pull, plus you had to really want to learn about them to
keep it running reliably (the Fuel Solenoid Driver was issue #1).

My preference based on the criteria you list would be one I didn't even
list - a 3-4 year old Chevy or GMC 3/4-ton with the Duramax 6.6L turbo
diesel and the Allison 1000 tranny (I have a 2004). Good mileage (20-21),
good reliabilty, and a great transmission. Just make sure it has a 3.73:1
rear axle for the highway.

My two cents worth - Jonathan
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4 6th September 17:19
trey
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Default Best fuel mileage, and reliability pickup diesel?


What year range are you looking for? what about price range? I have seen
reports of gues with the old 12V and 24V (pre1991-1998 range) ***mins Diesel
trucks getting 20+ MPG. A friend of mine had a '99 Ford Excursion 4x4
Diesel, he got about 16 MPG. With the new ***mins 600, many have said the
fuel economy has gone down (mainly due to such high power output) if your
not pulling anything, and if you dont care about the noise, then then the
12v or older 24v would be great, (if the trans will keep up)
As for Chevy, a lot of guy I have talked to said dont get a pre-Duramax. The
Duramax was built in collaboration with Isuzu, (whom have been making
Diesels for many years) So the engine is pretty solid (even with aluminum
heads) and then the Alison trans is pretty much the way to go when it comes
to transmissions. I think the Duramax gets around 15-16 as well.
I have heard a lot of mixed reviews about the new Ford 6.6 Liter Diesel.
their old 7.4 was a pretty solid machine as I recal. just not the most fuel
friendly since its a 7.4, where the Duramax is 6.6 and the ***mins is 5.9.
So just in those terms, the ***mins has less displacement, and does not
consume as much fuel at any given RPM (if all three engines were mapped to
use the same amount of fuel per liter)

What speed will you be traveling at most? 5mph? 30, 60 85? If your sitting
in slow traffic, I would think the ***mins would be better since it would be
in a lower gear at a lower RPM. but if your traveling at 60-80, Chevy has a
five speed trans, where Dodge has four. So the Dodge my run at a higher RPM
at freeway speeds. The two trucks may be geared differently to accomodate
the difference in transmissions though.
If your doing a lot of empty driving, I would go with a 3.55 or higher rear
end.

BTW, I am 01 few that do understand Binary.
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5 6th September 17:19
jonathan race
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Posts: 1
Default Best fuel mileage, and reliability pickup diesel?


Just for a clarification, the new Ford Powerstroke is a V-8 6.0L (not 6.6L)
turbo diesel with direct injection and an intercooler. The new tranny is
also a 5-speed similar to the Allison (but Allison is the King of the Hill).
The older 7.3L motors had only 2 valves per cylinder which is one reason why
they weren't that efficient. The new 6.0's use aluminum in their
construction similar to the Duramax, and use a variable vane turbo.

Chevy/GMC uses the Isuzu-designed Duramax V-8 6.6L turbo diesel with direct
injection, pilot injection, and an intercooler. The current Allison tranny
is a 5-speed, with a 6-speed automatic with selectable fully automatic or
manual shifting in 2006. This is currently the largest motor of the Big
Three. The latest version (LBY) uses a variable orifice turbocharger. I've
heard rumors that current 5-speed Allison's are upgradeable to 6-speeds with
only a computer update, although they won't have the selectable
automatic/manual shifting (6th gear being a double-overdrive).

All three manufacturers currently use 4-valves per cylinder, although most
were typically 2 valves per cylinder in the older models. Dodge made the
switch to 4-valves first, but although I have no concrete figures to go by I
can remember reading several folks writing that their mileage was pretty
poor for the first generation of 24-valve motors in comparison to the older
12-valve versions. I don't really know why.

Cheers - Jonathan
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6 6th September 17:19
nosey
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Posts: 1
Default Best fuel mileage, and reliability pickup diesel?


Primedia has a brand new magazine out called "Diesel Power". A friend of
mine has a copy of issue #1 that I recently read. It has a diesel truck
shootout in it and did a very good comparison on the Ford, Dodge, and GM
models available this year. You might want to check it out.
http://www.dieselpowermag.com
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7 6th September 17:19
badger
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Posts: 1
Default Best fuel mileage, and reliability pickup diesel?


I guess I should clarify too. I need to buy an older truck because of
price. 130-160000 miles or so.
Clay


well.

Diesel.

most

***mins is

and does

were

sitting

it would

Chevy

at a

differently to


higher
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8 6th September 17:19
badger
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Posts: 1
Default Best fuel mileage, and reliability pickup diesel?


Thanks, I saw that. It seem to focus on newer vehicles though which
makes sense.
Clay
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9 6th September 17:19
badger
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Posts: 1
Default Best fuel mileage, and reliability pickup diesel?


would be

Chevy has a

higher RPM

accomodate


higher rear

Well that makes 10 of us then.

I will be driving unloaded 95-99% of the time, and it will be mostly
highway. I really want a straight drive with a 3.4 or 3.55 ratio axle.
I put a deposit on a Chevy but the guy sold it out from under me. I'll
keep my eye out for a Dodge.

Clay
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10 6th September 17:42
sarge
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Posts: 1
Default Best fuel mileage, and reliability pickup diesel?


Not sure about Ford Diesels but I driven both Chevy and Dodge diesels. We
use Chevy's at work and they all have automatic transmissions. The latest
model is a 2002 and we get around 20 MPH on the highway. I drove the Dodge
trucks while playing porter for my wife who sells Dodge trucks. I picked up
and drove back to the dealership three in the last year. The best MPH came
from a 2004 Dodge 2500 Quad cab long wheel base with auto transmission. I
got 26 on the highway. This vehicle was brand new when picked up with only
3 miles on it. I had to drive it back from Tennessee to Louisiana so most
of the driving was interstate with the cruise control set at 70 MPH.

Sarge
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