NAfOcommando
Junior Member
Will removing the catalytic converter, adding a cold air intake and aftermarket exhaust help improve my mileage?
How to increase my gas mileage with the 5.7L Hemi?
- Thread starter NAfOcommando
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Zorin
Member
No.
Unless your catalytic converter is clogged, removing it will not help. Worse, removing it will trigger a P0420 DTC, and then the truck may failsafe out the PCM mapping, making you get WORSE gas mileage.
Cold air intakes are typically anything but. Atop that, K&N filters can foul out the mass air flow sensor, as they have oil in them to catch particles as part of their filtering media. Which, by the way, I wouldn't recommend them because they don't filter as well as a quality paper filter.
Newer vehicles actually have a VERY free flowing exhaust, you usually only see sound gains there.
Tim
Unless your catalytic converter is clogged, removing it will not help. Worse, removing it will trigger a P0420 DTC, and then the truck may failsafe out the PCM mapping, making you get WORSE gas mileage.
Cold air intakes are typically anything but. Atop that, K&N filters can foul out the mass air flow sensor, as they have oil in them to catch particles as part of their filtering media. Which, by the way, I wouldn't recommend them because they don't filter as well as a quality paper filter.
Newer vehicles actually have a VERY free flowing exhaust, you usually only see sound gains there.
Tim
Dark Knight 500
Senior Member
The only thing I’d do is swap out the oem muffler for something like this.
www.holley.com
As for the intake side, I have ran a k&n “cold air intake” for a few years, and the only gains I’ve noticed was sound.
I would recommend reading through the thread for the eco diesel Airbox mod to improve air flow.
www.ramforum.com
The factory intake is actually a really good (and true) cold air intake.
It could me just me, but I’ve noticed more pep (throttle response) with the eco diesel Airbox than I ever felt with the k&n.
Flowmaster 817633 Flowmaster Outlaw Direct Fit Muffler
The Flowmaster Outlaw® direct-fit muffler for 2009-2023* (*Classic body) RAM 1500 trucks with the 5.7L Hemi and factory dual tailpipes, is perfect for the person looking for a very deep and aggressive sound level inside and outside the vehicle. This system is not for the faint of heart! This...
www.holley.com
As for the intake side, I have ran a k&n “cold air intake” for a few years, and the only gains I’ve noticed was sound.
I would recommend reading through the thread for the eco diesel Airbox mod to improve air flow.
Better flowing intake for 5.7 w/Ecodiesel lower airbox
www.ramforum.com
It could me just me, but I’ve noticed more pep (throttle response) with the eco diesel Airbox than I ever felt with the k&n.
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pacofortacos
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No worry about fouling the Mass air flow sensor as the Hemi doesn't have one.
Best way to increase mpg is to decrease weight and decrease drag coefficient with aero mods.
If running heavy, over size, or aggressive tires, going to stock highway tread can improve mpg.
These can help with mpg without changing your driving habits, driving habits can improve or decrease mpg - depending. lol
Best way to increase mpg is to decrease weight and decrease drag coefficient with aero mods.
If running heavy, over size, or aggressive tires, going to stock highway tread can improve mpg.
These can help with mpg without changing your driving habits, driving habits can improve or decrease mpg - depending. lol
Fatbob Frank
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In my experience better sounding exhaust decreases my mileage cause I'm always on the skinny pedal..
Nomis
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Facts haha
Wild one
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Yea no,the trucks stock exhaust is a huge restriction,the log manifolds at best are a peanut port manifold,and the crushed Y-pipe leaves a whole lot to be desired,after the midpipe,the exhaust system isn't bad,but before the midpipe,it leaves a whole lot to be desired.That's why long tube headers and a decent midpipe are one of the best mods you can do to the trucks for a noticeable power gain.You can get around triggering a code when removing the cats,by doing the old school anti-fouler trick under the back 02's. I originally ran my truck around with no cats and defeated the code with anti-foulers,and also ran my wifes old 2016 5.7 Challenger and also her 2019 6.4 Challenger with no cats,both untuned,with anti-foulers. But as Paco said,the best way to increase milege is sticking with stock sized tires,and driving for milege.
Last edited:
aaronedmonton
Member
Slow down and keep RPM under 2k.
CheechDogg.0n37s
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What are you getting right now? ...
Elkman
Senior Member
It takes 4x as much power from the engine to push through the air at 70 mph as at 35 mph. The drag coeffient of a pickup is about the same as for a brick. Minimize short trips and avoid unnecessary stops by adjusting your speed and use moderate acceleration when starting up.
Semi drivers average 6-7 mpg with their rigs pulling trailers but the best drivers get 9-10 mpg with the same rigs pulling the same loads over the same routes. That is a gain of 50% more miles per gallon of fuel burned. There are guys that want to get the highest mpg with their Prius and this car provides 45 mpg with normal drivers but the guys that push the envelope get more than 60 mpg.
For my part I have a pickup that gets 16.2 mpg and a Rav4 plug-in hybrid that is averaging 99 mpg. Guess which one I use for trips to Costco and the grocery store and to go out to dinner?
Semi drivers average 6-7 mpg with their rigs pulling trailers but the best drivers get 9-10 mpg with the same rigs pulling the same loads over the same routes. That is a gain of 50% more miles per gallon of fuel burned. There are guys that want to get the highest mpg with their Prius and this car provides 45 mpg with normal drivers but the guys that push the envelope get more than 60 mpg.
For my part I have a pickup that gets 16.2 mpg and a Rav4 plug-in hybrid that is averaging 99 mpg. Guess which one I use for trips to Costco and the grocery store and to go out to dinner?
NAfOcommando
Junior Member
11 city 16 HWY. it came with the premium 20 inch wheels so it’s already higher up and less aerodynamically efficient
CheechDogg.0n37s
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Yikes .. when mine was stock I was getting 13-14 city and up to 20 hwy ..... what gears ? I had 3.21s before I regeared to 4.88s with the 20x12s with 37s ....
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How to save on MPG.
If driving, stay off the skinny pedal, maintain tire pressure correctly, drive conservatively and use a decent fuel.
BEST WAY: Leave parked, do not start, LOL.
Other Option: Get you one of these pictured below.
If driving, stay off the skinny pedal, maintain tire pressure correctly, drive conservatively and use a decent fuel.
BEST WAY: Leave parked, do not start, LOL.
Other Option: Get you one of these pictured below.
NAfOcommando
Junior Member
Yeah I don’t know. I’ll have to try and find out. How do I do that?
CheechDogg.0n37s
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Go to this link .. at the very end put in your vin number right after the = sign ... that is your build sheet and will tell you everything your truck came with stock from factory ..
Tray Burge
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Leaving it in the driveway will improve your gas mileage.
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Trade for a Beetle.
SwitcherLP
Member
Those upgrades CAN improve efficiency, but lets be honest-when your truck roars you will want to drive it so it ROARZ.
The best way I got better gas mileage out of mine, which I get about 10mpg, is to use my motorcycle as my daily driver. 50-70 mpg as long as I don't drive like an @&$#a+...which I admit is hard not to do when I can leave everybody else at the stoplight staring at the FJB on my plate lol
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Are you really asking or are you spinning the Wheel of Justification to sell the mods to a spouse or to yourself?
Wheel of Justification answer: Absolutely!
Logical answer: Not enough to matter. If you're actually concerned about fuel economy:
1) Drive slower
2) Accelerate easier
3) Reduce rolling resistance as much as possible, such as using a low rolling resistance highway tread tire
4) Improving aerodynamics. Lower ride height, smaller mirrors, air dams/diverters, etc.
Are wear the most significant gains are to be made. The first two are free, except for what you pay in fun. #3 is money unless you need tires anyway, unless your current tires are underinflated and you fix that. #4 gets pricey. Pricey enough that unless you're driving *a lot* at highway speeds you'll take a loooong time to recoup the money.
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