Have a Dodge Ram 1500 w/ 5.7 L Hemi. Mpg is 11.4. How can I make it more fuel efficient?


Asked by glentwilligear Jun 22, 2012 at 01:25 AM about the 2003 Dodge Ram Pickup 1500 SLT 4WD Quad Cab LB

Question type: Car Customization

Everything is factory. What can I do to up mpg?

25 Answers

James Boos

saw on Gearz show the other day if you put bigger exhaust and cold air intake gives you little bit better mpg. but easiest way is to go easy on the gas from a stop and getting onto highway. use less braking. but if you got a diesel truck you would get better mpg and depending where you live you can convert the diesel to bio fuel and get even more mpg and more power

2 out of 2 people think this is helpful.
Tom Demyan

Not much. Besides what James said, keep your tires properly inflated maybe a pund or 2 more in them.

1 out of 1 people think this is helpful.
Chase Sutherland

theres really not much you can do besides trading it in for a different truck. driving habits might help but all these claims for products to boost mpg are gimics. dont fall for them.

Justin Doucette

The biggest thing you can do to help is changing your driving habits.... coast to red lights, accelerate slower....keep the RPM down. Making sure it's well tuned up can also help slightly, properly inflated tires as was mentioned.. Switching your fluids to synthetic may also help, although whether or not it's feasible for you will depend on your situation.

Mike Tritle

Several years ago I took a driving class given by a company I was with. Since we drove mid size trucks and made lots of stops it was important to generate best mileage w/o costing us time. Basic principles are: 1) Accelerate smoothly and briskly from a stop. Not a jack rabbit start by any means but creeping up to speed actually hurts mileage and cost you and everyone behind you time. 2) Anticipate stops. Lights that have been green for a while (stale green) with traffic backed up on the intersecting road are soon to go red. Coast well in advance. As you get to know your everyday rounting, you can easily anticipate green to yellow, etc. By the same token, when the light ahead is red, coast down to anticipate the green so you don't have to actually stop. A running vehicle when stopped is getting 0 miles per gallon. BTW, use the right hand lane for this if you're on a multi lane road. DO NOT hold up traffic in the left (passing) lanes. 3) Route yourself to a minimum of left turns. Sitting waiting for oncoming traffic to turn left gets you; you guessed it... 0 MPG. 4) Use your cruise control whenever possible. Keeping a steady speed maximizes time and mileage. If you can't due to fluctuations in traffic, lay back and attempt to keep a steady speed as traffic speeds and slows in front of you. 5) Set the air pressure in your tires to the max pressure on the sidewall. Less rolling resistance results in less fuel used. 6) Ignore the owners manual. New plugs every 25K-50K miles will use less fuel. Change the air filter every 10K or get a K&N washable filter and clean and re-oil every 20K-25K Miles. These tips will get you some fuel savings if you're not already practicing. Try it for a couple of tanks and let us know how you do!

6 out of 6 people think this is helpful.

increasing horsepower will make you truck easier to move itself using less energy (fuel). my dodge 1500 got 12 mpg's i put a chip with a cold air intake and headers on it, now it gets 23

16 out of 16 people think this is helpful.

What kind of chip, headers, and intake did you use. I have a dodge 1500 express.

10 out of 10 people think this is helpful.
Kent Cash

Don't sell your Dodgeram, I own a 2005 dodgeram 4x4 hemi. With some work and know how, you can improve you gas mileage. I have 116,000 miles one my truck. I do my own work and have got my truck at 22-23 mpg using the bad gas we get today. I enjoy what I've done. With two more changes, I will be at or near 28mpg. Ground Shaker Racing Roxboro, NC

28 out of 28 people think this is helpful.
You think this is helpful.

I have the same question, and I know a guy who knows so much about any possible dodge vehicle he might as well created them himself! He told me to put a cold air intake, performance chip, and CAT-back exhaust (straight pipe, flow master muffler, etc.) So that is all in my plans for my truck. He said that is about all you can do and the total cost would be around $500. However if you do your own work can bring cost down and that is the route I am personally choosing. If you do not have the know-how then just price around, but look at quality of the places work too. Dont pay the cheapest work for something you will have to fix in 2 months yourself. I learned the hard way!

2 out of 2 people think this is helpful.

If you can get Ram 1500 with a 5.7 Hemit from 12 mpg to 28mpg, you are worth millions, if not billions. Also, the gas companies might try to eliminate you :) But I'm not thinking you can get 22mpg, let alone 28. So, no worries.

7 out of 7 people think this is helpful.
Justin Kleven

i have a molar(borla) catback mopar(aem) intake and diablo trinity and get 14mpg up from 12.5mpg

1 out of 1 people think this is helpful.
Jeff Whittemore

Does anybody have 2014 dodge ram with headers


I have a stock '05 ram hemi. I get approximately 18.5 - 21 mpg. I try to keep it around 65mph and I get this result the majority of the time. If the road terrain is mountain and hills your mpg will decrease dramatically. Mine fell to around 13-15mpg.

2 out of 2 people think this is helpful.

I've heard that if you remove the posie limited slip rear end there"s a big improvement about 600.00 and 5 hours Labour.

1 out of 1 people think this is helpful.
You think this is helpful.
Mike De Jesus

Theres not much u can do in the city just pay attention to driving habits however on the highway I set my cruise control to around 65 amd get 23-24 mpg on my 2014 Ram 1500 5.7. Without cruise control I was around 20-21 mpg.


I have a 05 Dodge Ram 1500 short bed 2 wheel drive with a 5.7 HEMI,also,I've put a set of Pacemaker Headers shorties,K&N cold air kit and a Mopar performance chip.Motors tuned to 400hp.runs well and my fule milage jumpet to 15 to 18 city to 20 to 22 open road set on cruz.I'm happy with the performance,course if I get to quick on the pedal the trk will lurch very quickly,and the fuel milage goes down.

2 out of 2 people think this is helpful.

Crank sensor took a crap and replaced on my 05 Dodge Ram 1500 ThunderRoad edition. MPG dropped 2-3 MPG, dont understand why. Can anyone put any logics to this?


My son has a 99' RAM 1500 4x4 5.9L and the computer says avg ~25 mpg on the highway, but in reality it is more like 18 mpg if you do the math. Mine is a 01' RAM 2500 4x4 5.9L (no computer) and gets ~15 mpg highway. That matches the sticker specs. It has a "locking differential" that I considering changing to a "open differential" to save MPG"s. Got that idea from this forum. Thanks.


i would say watch how hard you do it. if you are going to add a chip, headers, and intake just for fuel mileage are you really saving much money after putting into the modifications? you can buy a lot of gas for what you will put into it. if you are doing it for performance then that would be your call.


you can also replace your cam shaft.this will also increase horsepower


I was told that you need to change to ox sensors every 70000 miles. I did this and increased about 1.5 Meg in my 1999 dodge ram 5.9 liter. Have flow master and new heads and 239000 miles. Gets 15 average now. My computer always says around 18.5 though. I have been considering the kn and cold air intake. Drive 60 on the highway and conservative all the time.

Joseph Cantalupo

weird i have a 2011 dodge 1500 5.7 and my comp is saying i average 12.5 and all my miles are cruise control highway miles! what is wrong with my truck!!

3 out of 3 people think this is helpful.

Hi Joseph! It could be many factors. Depending on the mileage on the vehicule or if you're not using it often, a calliper could be sticking on, which would make the mpgs go down a lot.


Is anyone using Lucas products to help boost this as well? I see that a lot of people are saying that they are doing the modifications, but no one is saying what they are doing to treat their fuel. You should take into account the type of fuel you use and whether or not you're cleaning your system as well. I've got a 08' Dodge Ram 1500 4.7 V8 Flex Fuel and I have bought the K & N filter and placed an order for my exhaust to be done. I treat my tank which boosts my mpg by a few already. Currently right now I am averaging 15-16.5 mpg in town and 17.6 to 20 on the highway long as it stays at a steady speed. I use my cruise control and I have good driving habits. Like the others said, it is the combination of several things that help the over all.


I have a 2012 Ram 1500 RC/SB 5.7L Hemi/6-Spd AT/3.92 Gear Limited-slip Rear Axle. I use premium synthetic oil (5W20), premium oil filter (Royal Purple or K&N Gold) and use ZMax oil & fuel products. Modifications include a Volant Throttle body spacer, a K&N filter and a "true dual exhaust system". I have 11K miles as of April 2015. My actual real-world average MPG is consisently 14-15 city and 21-22.4 highway (68-70mph cruise control on, AC on, windows up). My all time best ever highway mpg for a road trip is 24.2mpg highway. I run Shell mid-grade (89 Octane) at a minimum but most of the time I run a 50/50 mix of Shell 89 & 91 Octane. I have not done the Tune (Computer Program) yet or the Cold Air Intake, shorty headers, upgrade to a mild camshaft or anything else yet. Naturally, I'm driving intentionally to "hyper-mile" but every now and then I do get on it hard and street race it. I'm considering replacing the 3.92 gear with the OEM 4.10 gear and upgrading the Transmission Torque Convertor (probably 200-300 increase in stahl speed) to go with the (someday) Edelbrock E-Force Supercharger, to go with the "Stroker" engine kit (5.7L/345ci to 6.4/392ciL or 6.7L/410ci...haven't decided yet). Of course, that will be the end of the great MPG my rated 390HP/407TQ truck is getting now. All in all, pretty damn good considering the performance, vehicle weight, and lack of the new 8-speed transmission (remember, I have a 6-speed...which actually is a modified 5-speed...2nd gear is "split" OEM and I'm running a 3.92 gear LS rear axle). Kudos to the RAM & Hemi powerplants engineering Team. Tom, Manhattan Beach Ca.

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