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-   -   MPG is garbage, who knew with a 5.7L Hemi? (

Redneck16 05-20-2013 06:01 PM

MPG is garbage, who knew with a 5.7L Hemi?
Now lets start by saying I'm not complaining, I bought this truck because I love the power and everything that comes with it. Just wondering if anyone else has any good tips for improving my MPG.

I got a 2007 5.7L v8 pretty much stock with a KNN cold air intake and I was gettin just about 9-10mpg in the city. I just installed a 18" body Magnaflow 3" intake with dual 2.5" outs, got a nice sound to it, and noticed my MPG at about 12.

Any other small changes or suggestions? I do got a bit of a lead foot but I'm workin on that, thanks in advance.

Hermes1 05-20-2013 07:01 PM

Really there is little that can be done to improve MPG or I am sure RAM would have been all over it. The biggy is monitoring the weight of your right foot, but other driving habits come into play as well. Other than that, keeping tires properly inflated and not carrying around excess un-needed weight can help. I am averaging 13.5 MPG around town and highway mileage seems to hover around 17MPG, although I have not been on an extended enough trip to get a more accurate highway mileage result.

gonefishin776 05-20-2013 07:21 PM

I have the same truck and when I was stock I got about 15/16 city and 18/19 highway.

clean up some things, Change ur sparks plugs, make sure ur air filter is clean, clean TB. and try keepin ur foot out of it a bit. u shouldn't be THAT low. shit I get better than that with 35" mud tires.

RogerRamJet 05-20-2013 07:57 PM

How hard you get on the gas from a stop, how long you're on the gas before you stop (hard stops) tire inflation all play apart in sucking the mileage out of your tank. Check EGR and PCV modules and make sure they are clean. Make sure the IAT/MAP sensor(s) are clean. Run some gas treatment/injector cleaner through it. Make sure your intake is clean. All these little things add up to 3 or 4 mpg either way.

Thet 05-23-2013 07:16 AM

It's actually more fuel efficient to NOT baby it all the way to full speed, rather more a 50ish% acceleration.

Say, it takes you 20 seconds to get to full speed at 25% throttle. At that "25% throttle", say you're getting 5 MPG.

Now say you accelerate at 50% throttle, or more, and you get 3-4 MPG, but it only takes you 10 seconds to get to full speed. You're using less fuel getting there this method than the other. OBVIOUSLY, you don't want to go balls to the wall, but don't be a granny about it either. lol

Sparkyy 05-23-2013 09:23 PM

OP, I get pretty much the same gas mileage as you do with my 2007, just did the Mohegan Sun M&G and avg something like 13.5mpg round trip.

I have nothing in my bed and it's covered as well so that should help some but she also just hit 60k and not sure when the spark plugs were last changed as she had 48k when I got her used.

That is next on my list along with replacing my tranny and diff fluids. Always something to do but you have to love the power of these beasts.

70x7 05-23-2013 10:39 PM

i hear ya, i get avg about 13-13.5 and with all the mods I have, I feel like it sucks....
oh well I guess. I try not to pay attention as much as I can...

Wyte Mike Gilliland 05-24-2013 11:40 AM

Buy a obd2 bluetooth adapter, you can get them on amazon for about $30. Download the app torque, another $5 to your phone/tablet. It will monitor your trucks mpgs, clear codes, all type of stuff. Its a cheap buy and absolutely amazing how it will help your driving habbits, maintenance your vehicle, track 0-60 times, everything.

Redneck16 06-12-2013 12:39 PM

Thanks for all the help guys, I was also hearing that a Diablo Programmer would help out with that. I'm gonna get on all these suggestions though, I mean who doesn't like more bang or their buck?

wolfman01 06-22-2013 11:23 AM

Some other things to do is not let the vehicle idle. Stay out of drive thru lanes at the junk food resturants. I still haven't figured out why people are so insistant on idling away for 15 to 20 minutes in the packed drive thru lane when they can walk 50 feet to the totally empty counter. ;) Also, don't do the warm up in the driveway thing. Those are two often overlooked areas for improving MPG.

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