poor mpg

Raymond Cramer
5

Asked by Raymond Sep 04, 2009 at 08:42 AM about the 2005 Dodge Ram Pickup 2500

Question type: Car Customization

i got a 2005 ram 2500 with a 5.7 hemi ,is there any way to increase fuel milage  only gettinf around 11mpg  thanks

12 Answers

Josh Schonert
75

one of the things you can try is to get yourself a cold air intake (k&n filter can work well too), a better flowing exhuast, and the Edge Chip to control how your fuel system is being used....if low on cash...go for the intake and that should help. sometimes a bed cover can add a couple mpg's as well.

3 out of 3 people think this is helpful.
Chase Sutherland
4,105

AFE stage 2 CAI is the best out there for the hemi. heat soak on these engines also starts at 190 degrees F. putting in a new t-stat will also help a bit. adding in a full exhaust system will help out also. and there is the chip to add that would help with all these mods. i would start with the AFE and t-stat. $400 and about 2-3 mpg increase (maybe even more).

5 out of 5 people think this is helpful.
Myles Wickins
55

I have an 03 2500 5.7L with the flashpack superchip, custom dual flowmaster exhaust with no cats and a k&N cold air, would changin the t-stat be a good plan, also Im not sure why but at full throttle it shifts at about 6600 , right when it shifts it coughs, when I have the wheel turned it even jerks a bit, any ideas?

3 out of 3 people think this is helpful.
Chase Sutherland
4,105

the tstat is a good upgrade. gives more power and fuel efficiency thats lost to heat. no idea about the cough though.

1 out of 1 people think this is helpful.
jml12345
1,495

one other thing that can do it is the knock sensor. if its bad ,just unplug it.

1 out of 1 people think this is helpful.
Myles Wickins
55

Right on, I will get on both of those, thanks guys

Jazmin Dennis
35

out a tuner on it. if you supercharge it that actually makes it get better gas mileage too. superchips or hypertech will give you the best gas mileage. and getting 11 out of it is actually decent. its a hemi. its a big motor. its meant for power and torque not gas mileage. if thats what youre looking for might as well trade it in.

Chase Sutherland
4,105

Hypertech and superchips are not the best for the hemi. Diablo is the best for tuning on the hemi.

3 out of 3 people think this is helpful.
Myles Wickins
55

Im not expecting better gas milage out of it, thanks for the leason but I know what a hemi is and mixed with a 3/4 ton I know my milage is always gonna suck, but if it is possible to bump it up a couple mpg's then why the fuck not

1 out of 1 people think this is helpful.
jml12345
1,495

try dual fuel, gas and propain.

2 out of 2 people think this is helpful.
GHEMI196
0

I have a 2005 Ram 2500 5.7 Hemi and there are several things that help. I use the Superchips Flashpaq programmer and I run in performance mode, which has many options. I like being able to set my wot shift points from 1st to 2nd and 2nd to 3rd and it performs better by shifting at about 6,000 rpm since you are in that peak crossover in Torque and HP. I tried higher revs but power drops off if you shift out too high and although you can let it rev to 6600 rpm you are not making your best power at that rpm, at least on an 05. Airaid intake, I originally had a Gibson Twin sport cat back but when it rotted out since it was too loud I welded up a cat back duals through a Flowmaster 40 dual exit. True dual would breathe better. Now some may laugh but I have the inline Fitch fuel catalyst system that keeps fuel fresh and bumps octane 2 points. You are supposed to run 91 octane but I use midgrade 89 and have no issues. Now it depends on the time of year and where you live. I'm in CT and we have way too much ethanol in our gas and the winter blend is the worst for fuel economy. I kind of wish when I bought it I got the '06 with MDS but I wasn't confident since it was the first year in Dodge trucks. Now really if you are heavy on the pedal fuel economy dives and I only average slightly more than you do in the spring, summer and fall since colder air gives you more power but less fuel economy. Now if I'm mellow and on the highway mostly I will average about 13.5 at 70-75 mixing in some local driving. Highway with cruise control on I max out at 15.5mpg and my 2003 was 2wd it did a little better than my '05 4wd. Spark plugs! Well they came with Champion copper and in the manual the tell you to change them at only 30K. I did mine at 50K after going through emissions; oh if I go back to stock program I drop 2 mpg. I put in NGK's since I never liked Champion plugs. Tire Pressure makes a difference and since the 2500 is 3/4 ton you run load range E tires with a max pressure of 80 psi and I keep mine at or near max pressure. Never run any tire at less than 80% of max pressure both for safety and less rolling resistance. I run all synthetic oil in the engine, tranny, and differentials. Bottom line is that it is a TRUCK and yes-newer models get better mpg. Now I haven't done it yet but if you bought or made your own Hydrogen cell assist that will improve mileage a lot. There is a company I checked out called Aqua tune but then I can't use my programmer and I could make a better system myself. Really an engine is like a big air pump and the better it flows the better the power and MPG's. GHEMI196

Michael Mangano
10

If spending money to save money (better mpg's) is an option for you... Find a reputable speed shop and have your combustion chambers cc'd & polished. Have your exhaust & intake ports port matched, opened up and polished on the intake and roughed on the exhaust (polished allows the air/fuel mixture to flow better and roughing the exhaust allows better scavenging) if you want to go all out you can have work done on your intake manifold and throttle body (matched & polished). The less mismatched venturies and bumps anh humps, the better your engine will flow air in and out. Good performance = good performance = good air flow.

1 out of 1 people think this is helpful.

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