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cptndan
 
  2009 Ram Laramie mileage issues. - Posted: 01-20-2013, 08:41 PM
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Post #1

How can I improve the mileage on my 2009 Ram Laramie? I am getting 2-3 mpg less than my previous similar Ram trucks.

I have previously owned a 1997 Ram SLT (360 cu in V8) and a 2010 Ram TRX 4. Both these trucks consistently got 15-16 mpg in small town/rural highway driving and 17-18 mpg on the highway. I put 185000 mi on my 97 and 34000 on the 2010 before upgrading to the 09 Laramie which had only 14000 mi on it. The 2009 only gets 13-14 mpg combined and 15-16 mpg highway (1 mpg worse in winter!). I have not changed any driving habits. My 97 did have a K & N Air Raid air filter on it. I have noticed that the "fuel saver" light on the 09 only lights up when I am coasting or braking or going downhill. It very seldom activates while maintaining speed. The instantaneous mileage bar graph on the 2010 seemed to indicate that the fuel saver functioned more often.

My wife and I love everything about our Dodge except the gas mileage. Recently I nearly bought a Ford F150 but I felt the comfort, room, storage options and functionality did not come close to the Dodge. The Ford did get about 3 mpg better gas mileage in test drives however. Could there have been a fuel saver computer update after 2009? Would another K & N filter be worthwhile? Hoping for any help!
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ramryder77
 
 Posted: 01-21-2013, 12:34 AM
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Post #2

How many miles on it now and what kind of gas are you using? It maybe time for a tune up a CAI and a programer may really help
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Palomba
 
 Posted: 01-21-2013, 01:33 AM
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Post #3

your trx probably had 3.92 and your laramie 3.55
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BMRbrnSNRbrd
 
 Posted: 01-21-2013, 05:35 AM
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Post #4

I'm with Palomba...what was the gearing on the previous trucks and what gearing is in your new one?
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compressor man
 
 Posted: 01-21-2013, 06:00 AM
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Post #5

Check your plugs and change to synthetic oil, then go from there.
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cptndan
 
  2009 Ram Laramie mileage issues - Posted: 01-21-2013, 07:52 AM
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Post #6

It has 39000 miles on it now. I bought it 15 months ago with 17000 miles on it.
It had a tune up and complete scheduled servicing at 32000 miles last summer.

I would like to do something to improve the mileage but I am a little gun shy about spending a lot of money without a good prospect of improvement. The truck and the gas cost a lot already.

I would be happy to just get back to what my '97 got for mileage.
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BMRbrnSNRbrd
 
 Posted: 01-21-2013, 08:16 AM
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Post #7

So...what rearend is in it?
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Mineral Gray 2010 Dodge Ram CC Hemi Sport


Exterior: Limo tint | Painted tips | Painted calipers | De-badged | Painted grill inserts | Gloss black b-pillars | Color matched antenna base |
VHT tinted puddle lights | Color matched tailgate handle | Shaved and two-toned grill | Painted Vararam lid w/ two-toned Ram badge |
Color matched Laramie 2500 flares | Shaved tailgate badge | Shortened and painted antenna
Lighting: Color matched headlights retrofitted with 5000k Morimoto projectors |
5000k HID fog lights tinted with Lamin-x | 6000k HID retrofitted reverse lights
Interior: Color matched interior plastics | 2 MTX 12" subs in a cheap box | REN MyGig 30gb headunit | Black microsuede wrapped headliner and sun visors | Black microsuede wrapped and shaved pillars | Black microsuede wrapped custom made door inserts | SEM black painted interior plastics
Suspension: McGaughy's 2/5 Economy drop | BrakeMotive cross-drilled and slotted rotors | All black Milano M724 22s | 305/40R22 Nitto 420s | AirLift Helper Bags
Performance: Superchips Vivid Paq w/ trans tuning | Vararam Air Grabber | Magnaflow 18" Muffler | Raceland USA E-Cutout |
Billet Technology Oil Catch Can | Clutch fan delete | 180 T-stat | Magnaflow Y-Pipe with relocated crossover pipe

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cptndan
 
  Mileage reply - Posted: 01-21-2013, 08:18 AM
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Post #8

I'm not sure my last attempt to reply worked.

39000 miles on the truck now. Complete tuneup and scheduled maintenance at 32000 miles.

I'm not sure of the rear end gear ratio but the dealer checked the VINs and said all three trucks were similar.

Thanks
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cptndan
 
  2009 Ram Laramie mileage issues - Posted: 01-21-2013, 08:20 AM
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Post #9

I will check the gear ratio. I gave the service department the VIN nos. on all three trucks and they said there was no major difference. I will keep trying.

Thanks.
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cptndan
 
  2009 Ram Laramie mileage issues - Posted: 01-21-2013, 08:21 AM
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Post #10

I will check into the gearing further. I gave the dealer the VIN nos. of my other two trucks and they told me the gears were all the same.
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cptndan
 
  2009 Ram Laramie mileage issues - Posted: 01-21-2013, 08:23 AM
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Post #11

Plugs were replaced 7000 miles ago. I will check them again and will try the synthetic oil.
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..stiffler..
 
 Posted: 01-21-2013, 08:24 AM
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Post #12

Quote:
Originally Posted by Palomba View Post
your trx probably had 3.92 and your laramie 3.55
You mean other way around. His 09 Laramie probably has 3.92. Higher the gear ratio the worse the mpg.

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cptndan
 
  2009 Ram Laramie mileage issues - Posted: 01-21-2013, 08:26 AM
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Post #13

I will have to check the actual rear end ratio. I just asked the dealer to compare the engine and gear specs for the three trucks and they told me they found no major differences.
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vandersnoot
 
 Posted: 01-21-2013, 09:04 AM
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Quote:
Originally Posted by ..stiffler.. View Post
You mean other way around. His 09 Laramie probably has 3.92. Higher the gear ratio the worse the mpg.

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Not necessarily......my last truck was an 06 quad 4x2 with 3.92 and got 2-3 mpg better than my 07 single cab 4x4 with 3.55

The weight difference of the quad to single should offset the 4x4 difference
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..stiffler..
 
 Posted: 01-21-2013, 09:30 AM
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Post #15

4x4 will get different mileage. More moving parts which means more drag.

If you compare the exact truck but have a 3.92 - 3.55 the 3.92 will get less mpg.




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Sillygoose
 
 Posted: 01-21-2013, 09:52 AM
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Post #16

Quote:
Originally Posted by ..stiffler.. View Post
4x4 will get different mileage. More moving parts which means more drag.

If you compare the exact truck but have a 3.92 - 3.55 the 3.92 will get less mpg.




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not necessarily. depends on driving conditions/how the truck is being used
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I_Digg_Durt
 
 Posted: 01-21-2013, 11:33 AM
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Post #17

I tend to agree with silly goose. The 3.92 seems to get better mileage. Especially if you are over 70 mph.

Also if your 2010 had the 17" wheels and your 09 has 20" wheels that is worth at least 1mpg in real world driving.
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..stiffler..
 
 Posted: 01-21-2013, 03:02 PM
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Post #18

Read my post. This is comparing the same truck to the same truck.

I'm not comparing a truck with 3.55 gears hauling a 29' trailing to a truck with 3.92 gears unloaded.

I'm not comparing a 2x4 truck reg cab with 17" wheels to a truck that is 4x4 crew cab with 20" wheels.

The same truck, same conditions, same driving style and speed the 3.92 gears will give you less mpg. With 3.92 gears your rpm will be higher than 3.55 gears. This will use more fuel.

Common sense people it goes along way.

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I_Digg_Durt
 
 Posted: 01-21-2013, 03:14 PM
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Post #19

Quote:
Originally Posted by ..stiffler.. View Post
Read my post. This is comparing the same truck to the same truck.

I'm not comparing a truck with 3.55 gears hauling a 29' trailing to a truck with 3.92 gears unloaded.

I'm not comparing a 2x4 truck reg cab with 17" wheels to a truck that is 4x4 crew cab with 20" wheels.

The same truck, same conditions, same driving style and speed the 3.92 gears will give you less mpg. With 3.92 gears your rpm will be higher than 3.55 gears. This will use more fuel.

Common sense people it goes along way.

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Less rpm doesn't mean less fuel used. Mpg is all about engine load. That topic has been beaten to death on many topics on here. In my experience the 3.92's allow the engine to run with less load. Which in turn allows the mds to kick in more often. Hence resulting in better mpg.

What was that about common sense?

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Sillygoose
 
 Posted: 01-21-2013, 03:17 PM
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Post #20

Quote:
Originally Posted by ..stiffler.. View Post

With 3.92 gears your rpm will be higher than 3.55 gears. This will use more fuel.
simply not true. engine rpm's are only part of this. it's about engine efficiency/load varying with rpm's.
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