WOW my 4.7 either on the hwy or city never ever has got above 11.5mpg

 

an old post
using the 'raw' EPA lab tests on MPG
for various engine options and years on Rams:
=======
below is an old post with more info on the subject of
5.7 vs 5.7MDS vs 4.7 vs 5.9
fuel economy
---------------
At least this month (Jan 2007)
Chrysler has been offering the 5.7V8 with MDS as a
"no cost upgrade"
over the 4.7 on Rams
and pointing out to customers that
the 5.7MDS has better EPA MPG test results by about 1.
When evaluating this, keep in mind that you are comparing a 5.7V8 running on 4
cylinders (and dragging along 4 not being used) at a speed of 55 mph to a
4.7V8 running on eight cylinders also at a speed of 55 mph.

At speeds of 70-79 mph the MDS on the 5.7 Ram will not kick in unless you are
going downhill, or have a wind at your back. Here at higher speeds the 4.7
might regain an MPG edge.

Even before MDS was introduced on the 5.7V8
the unmodified EPA lab results were showing
that the 5.7 was within 4% of the 4.7 V8
in fuel efficiency.
The actual test results are available online from the EPA at:

http://www.epa.gov/fueleconomy/data.htm

to see the actual results go to this link:

http://www.epa.gov/otaq/tcldata.htm

These are not the 'Window Sticker' numbers,
these databases have the actual city and highway test results down to a tenth
of a mpg. This makes it easier to compare. Since 1985 EPA has applied a
'fudge factor' to these actual results to get the number that you see on the
Window Sticker. This happened because citizens complained the EPA city and
highway numbers were TOO HIGH compared to 'normal driving'. Next year EPA
will apply an even greater 'fudge factor' because citizens are still
complaining that they can't get at 79 mph the MPG that EPA measures at 55 mph.


If you look at the 2003 year numbers
you can compare the Magnum
5.9V8 to the 5.7V8 (without MDS back then)
and to the 4.7V8 and 3.7V6

3.7V6 2wd had 25.4 MPG highway with 45RFE and 3.55 diff
4.7V8 2wd had 24.2 MPG highway with 45RFE and 3.55 diff
5.7V8 2wd had 23.3 MPG highway with 545RFE and 3.55 diff
5.9V8 2wd had 22.0 MPG highway with 46RE and 3.55 diff

Chrysler's official press release on the 5.7 Hemi said that it was 8-12% more
fuel efficient than the 10 year old Magnum 5.9V8 design.

But notice
in the above that in the 2003 Ram pickup the 5.7 Hemi was only (23.3/22) 6%
more efficient at highway speed. This may be because the 545 automatic
transmission has more internal friction when in overdrive (where it has two
planetary gearsets turning) compared to the older 46RE auto that only had one
planetary gearset turning.

For comparing the 5.7 with MDS to the 4.7
look at the 2007 year numbers.

4.7V8 2wd had 23.7 MPG highway with 545RFE and 3.55 diff
5.7MDS 2wd had 25.4 MPG highway with 545RFE and 3.55 diff

Adding MDS to the 5.7V8 at a steady 55 mph improved it by
(25.4/23.3) or 9%
This matches what Chrysler said in their press release about MDS on the 5.7V8
where they wrote the most gains were below 60 mph, with maximum gain of 20%
around 45 mph.

2wd 5.7 Rams will be able to go a little faster in MDS mode and get better MPG
than 4wd Rams because the extra driveline friction and weight of the front
axle loads the engine down more.
=======
Torque in the important 1500-2500 rpm range
is much greater on the older
Magnum 5.9V8 than on the 4.7V8

See these rear wheel dyno curves
and look at the 'stock' torque numbers for each engine:

for the 5.9
http://www.hypertech-inc.com/dynodgtrk.html

for the 4.7
http://superchips.com/~superchips/pr...akepdf-822.pdf

 

i have an 04 4.7 5 speed with 4.56 gears and just finished off a tank today at 17.1 at 55-65 mph with 60/40 highway driving when im on it get around 15 have never been in the 13mpg even when i went from the stock 17 to 20s before gear swap

 

I get 14.5 solid and I dont baby it at all ......when I do i can get between 16 and 17 tailgate down on the highway account for 1mpg better

 

The tailgate down thing is a myth and doesn't help mpg. When you're a driving, a air bubble forms in the bed as long as the gate is up...the air flows around the bubble. With the gate down a bubble can't form but the air can escape which negates any negative or positive effects.

 

The only way I can improve my mileage on my 2001 Dakota club cab with 334,000 miles was to install a HHO kit hydrogen on a gallon of water I now get 24 miles per gallon City not quite sure yet what I get on freeway I just installed it last week

 

Explain how you calculate your mileage please.

 

Every legitimate test I have seen says this is BS.

Not to mention, this thread is 14 years old.....

 

I suspect CDM is a spammer

 

Yeah, me too. But, no link to his "miracle" product.