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  #37  
Old 10-10-2010, 10:15 AM
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Re: Real world mileage numbers for V6 and Hemi?

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Originally Posted by Djeazie View Post
19 mpg everyday with mixed. V6
+1
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  #38  
Old 10-10-2010, 12:29 PM
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Re: Real world mileage numbers for V6 and Hemi?

LOL

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  #39  
Old 10-11-2010, 11:11 AM
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Re: Real world mileage numbers for V6 and Hemi?

Just finished about a 2000 mile trip in my V6 Overland 4x4. The computer said it returned 21.5mpg. Seeing as how it was a green engine, I kept it around 80mph, and there was a fair amount of tooling around in town, that's pretty good. Once it's all the way broken in, I'd expect 24ish mpg highway.
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Old 10-11-2010, 12:53 PM
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Re: Real world mileage numbers for V6 and Hemi?

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Originally Posted by Technosavant View Post
Just finished about a 2000 mile trip in my V6 Overland 4x4. The computer said it returned 21.5mpg. Seeing as how it was a green engine, I kept it around 80mph, and there was a fair amount of tooling around in town, that's pretty good. Once it's all the way broken in, I'd expect 24ish mpg highway.
Did you have any passengers in rear seat? It just didn't seem very comfortable to me.
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  #41  
Old 10-11-2010, 12:56 PM
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Re: Real world mileage numbers for V6 and Hemi?

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Originally Posted by JoeSchmoe007 View Post
Did you have any passengers in rear seat? It just didn't seem very comfortable to me.
Only 2 people total in the vehicle. We both sat up front.

The back seat is worlds better than previous generations and far superior to what passes for a backseat in many sedans- the current style toward a sloping roofline means anybody in the 6 foot height range ends up using the rear window as a headrest.

I've yet to hear a single complaint from anybody in the back, and I have indeed driven with a full 5 person load- not extended trips (maybe a half hour or so); they seem to be plenty comfortable.
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  #42  
Old 10-11-2010, 08:30 PM
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Re: Real world mileage numbers for V6 and Hemi?

I sat in the back of mine for a bit....very comfortable and lots of leg room. HUGE improvement.
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  #43  
Old 10-12-2010, 09:19 PM
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Re: Real world mileage numbers for V6 and Hemi?

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Originally Posted by Jim Hef View Post
You want to explain how higher revs on the highway will result in better fuel mileage???

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Originally Posted by HEMInator View Post
Exactly! Higher ratios will DECREASE fuel economy
on the highway and INCREASE in the city. On the RAMs, the standard ration on the 2009s was 3.5X whereas the option existed for around $375 I think to add 3.92 gears. I added 3.92 gears which actually sees about a 1mpg increase in city and 1 mpg decrease on highway so the overall fuel economy is the same but the low end acceleration is definitely better and it increases towing capability.
Guys... Lugging an engine will NEVER increase fuel economey! NEVER.

Simple Math is in favor of CORRECT gear ratios... My point is they are absolutely WRONG in our vehicles from the factory.

I have very specific experience with the combination of rear gear ratios, tire hights and 45rfe/545rfe transmission overdrives... When I went from 3.55 gears to 4.56 gears in my 2002 4.7L QC Ram with the 45RFE trans (.75 overdrive) only raised my RPM by 300RPM@60MPH... So I was just over 2100RPM@60MPH. I gained 3-4MPG at 60MPH! .... Simple math and physics back this up. Dont forget this is with a 45RFE .75 overdrive... the 545RFE offers a dual .75/.67 overdrive.
(they are both the EXACT same transmissions with the only difference being the programing)

____________________________________

With that said... beyond popular beleif, RPMs alone do NOT dictate fuel economy. Its the load on the engine at ANY given RPM that has EVERYTHING to do with fuel economy. Lower RPMs do NOT always mean better fuel economy as most think. By going too low of an RPM you increase the load on the engine... Chose a gear that will get you slightly deeper into your torque curve and you will see improvements on fuel economy & overall performance.
_________________________________________

Here is some simple math to help you best decide on what gear ratio to chose...
_________________________________________

STEP 1:
Find overall gear ratio-
OVER DRIVE GEAR x REAR GEAR = OVERALL GEAR RATIO (OGR)

STEP 2:
FIND YOUR RPMS at ANY SPEED-
SPEED x OGR x 336 / TIRE HEIGHT = RPMs
_________________________________________

1) OVERALL GEAR RATIO (Factory Gear Ratios 3.42)
.75x 3.42 = 2.56 OGR
.67x 3.42 = 2.29 OGR <--- OMG!

2) FIND RPM @ SPEED
60MPH x 2.56 x 336 / 30" = 1720rpms (.75 overdrive)
60MPH x 2.29 x 336 / 30" = 1539rpms (.67 overdrive)

Does anyone here think there engine makes enough torque at 1539RPMs to hold a 2.29 OGR? Let me help... Perhaps down hill but not on nornal roads. So if your lucky your engine will be spending most of its time in the 2.56 OGR (.75 overdrive)
_________________________________________

NOW Same math... BUT gears that put us closer to the desired 2000RPM@60MPH. I will use 4.56's because experience has already proven them to be the most mathamatically correct gear ratio for our combinations.

1) OGR
.75x 4.56 = 3.42 OGR
.67x 4.56 = 3.05 OGR
_________________________________________
2) Find RPM@SPEED
60MPH x 3.42 x 336 / 30" = 2298rpms
60MPH x 3.05 x 336 / 30" = 2049rpms <--- Bingo Money maker!

In my experience I have found that a good rule of thumb is to aim for 2100rpm's@60MPH. This gives us the best all round performance gains to include fuel economy.

With the .75/.67 545RFE, 30" tall tires and 4.56 gears you will see increases in MPG from 1MPH to 70MPH! This is not an opinion... this has been proven over the years with the same combinations on the Rams, Dakotas & Durangos!

Just do the math... You just may learn somthing new.

For all those "LOW RPM" Guys... Try a little excersise.
Next time your on the freeway... set your cruz to 50-60MPH... With out touching anything else watch your actual MPG gauge. You will see that on flat ground youll get say 20MPG... But as soon as you hit an incline your MPG drops to 13-14MPG... and hit a decline and it shoots up to 30+MPG... nothing changes except the load on the engine... Lower the load on the engine and your MPG increase. This entire time the RPMs have not changed... This backs up the fact that by simply moving the load from the engine to the gears, we are able to increase the fuel economey. The CORRECT gear ratio in the rear can and will increase MPG and performance.

Who would not want that?

Now the best thing about 4.56's and the new OGR... as with MDS cylinder deactiveation... we now have MORE mechanical advantage to hold the MDS to 4 cylinders under higher loads... meaning your MPG will increase even more!

SPEED SAFE, NICK
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  #44  
Old 03-21-2011, 04:43 PM
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Re: Real world mileage numbers for V6 and Hemi?

Hello all,

I have a 3.6l Laredo X with the MP3023 TC, 9,000 miles total.
I just put about 4,000 miles on in 2 weeks, almost all highway 65-75 m/h.
Max I got was 25 down to 22 on mountains. I normally got 13-15 in the city before the trip and now get 15-17 city. (All mpg by info display only) Before the trip I had the oil and filter changed and went with a Pure PAO basestock synthetic oil. I also put in a K&N air filter for good measure.
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  #45  
Old 03-22-2011, 08:57 AM
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Re: Real world mileage numbers for V6 and Hemi?

I have a 2011 Hemi and drive almost all city. 0-30mph and redlights and stop signs every block. I have 1300 miles on the Jeep so far and the gas mileage is 12.3 as of this morning.
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  #46  
Old 03-26-2011, 03:52 PM
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Re: Real world mileage numbers for V6 and Hemi?

hemi & awd
13mpg city and 19 hwy.
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  #47  
Old 03-27-2011, 04:48 PM
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Re: Real world mileage numbers for V6 and Hemi?

Just got back from a ~400 mile trip. Got 13.5 L/100KM | 17.42 US MPG | 21 IMP MPG. 98% was highway, driving anywhere between 65 and 75 mph. This is with the V6.
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  #48  
Old 03-28-2011, 06:56 PM
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Re: Real world mileage numbers for V6 and Hemi?

We have the 2011 with the 5.7 Hemi and have 8300 miles - all city stop/go driving. I used to run exclusively 89 octane gas and got 13.8 to 13.9 MPG in the city, according to the EVIC. Now that gas has skyrocketed, I thought I would try 87 to see if there would be any ill effects. The engine runs fine (no pinging, etc.) and we now get 15.1 MPG in the city. I am not sure if it is finally broken in, or what, but I am staying at 87, with a tank of 89 every couple of months.
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