5.9 and better fuel mileage what can i do
 

i know that having a 360 is not the best for an economy truck, but what can i do ti improve on my current 12.3 mpg? its a 99 sport 4x4 with 26k on the clock. any help is needed

RE: 5.9 and better fuel mileage what can i do
 

i have a 00 ram 1500 4x4 quad cab with a 360 too, but i maintain better gas mialage than you do, i have a AEM brute force cold air induction intake, and clean the throttle body out once a month, and this has given me more HP fromt the intake, and better economy as far as gas goes. im getting on hwy 17(ish) miles per gallon, and street i get about 14(ish) not too bad for an old girl. she has 125k miles and running strong, eventhough i just shelled out money on the torque converter, and transfer case. she decided going from NJ to So Cal was a rough ride.. so im paying for it now. hope you have a good night, and a great holliday

RE: 5.9 and better fuel mileage what can i do
 

do you get on it alot or go over 70 alot cause getting on it really sux down ur gas and going over 70 w/ aero dynamics and everything reallly sux ur gas also

RE: 5.9 and better fuel mileage what can i do
 

00' 4x4 regular short box, and i'm rocking the 11.1mpg...but I got a heavy foot too :D oh yeah 60k on the clock

Air Pressure
 

You might go closer towards the maximum safe pressure of your tires.

I have a 5.9 and get about 19/15 mpg due in part to having 50 psi in the tires.

The funny thing is the ride is still plenty smooth but we have some pretty good roads.

RE: Air Pressure
 

What size tires ya running? When my '97 was stock with 245's and an automatic transmission, I got 15-16 normally, 12 with a loaded car trailer. I went up to 285 tires and now have a manual transmission. I'm pretty sure the computer is in "limp home" mode (not good) but I get 12 all the time now- on the highway, around town, with the loaded car trailer, doesn't matter. I'm hoping for a big improvement when I install the new computer and 4.10 gears.

RE: Air Pressure
 

damn, I'd kill for 17 mpg at anytime out of my truck. I get 11.8 mpg however my plenum is leaking and I think it's killed my o2's. before it started leaking I'd get 14.5 mpg on 91 octane (crap gas here in CA) with a very heavy foot.

2 mods that I've done really helped milage, 1 being the 52 mm fastman throttle body, added 2 mpg and 2 was adding a fuel cooler (do at your own risk) which added 6% better milage which was measured over a 1800 mile trip (cooler was added at the 1/2 way point and I kept track of milage).

All of the other mods in my sig just boosted power and did nothing for mpg. oops, I take that back, no the dual out flowmaster has been reduced from 2 1/2" down to 2 1/4" to bring back a huge amount of low end torque which bumped mileage back up 1 to 1.5 mpg after the inital install...

.

RE: Air Pressure
 

I get about 17-18 mpg combined city/highway with mine. 318, auto, 3.55's, 265/75 tires (about 35 psi), K&N FIPK, gutted cat. convertor w/dynomax muffler, and a heavy right foot.

RE: 5.9 and better fuel mileage what can i do
 

i hear a whistleing sound almost like a turbo. it starts when i accelerate, and gets louder when steady or decel. any ideas?

RE: 5.9 and better fuel mileage what can i do
 

not a clue


97 ram 1500 5.9 3.55 reg cab reg bed 245/75/r16 2x4 w/ about 400lbs in the bed hgwy city combined lil more hgwy than city ~17 mpg

RE: 5.9 and better fuel mileage what can i do
 

I would check for a vacuum leak, might also explain your mileage.

RE: 5.9 and better fuel mileage what can i do
 

i get 9 miles a gal lol.

1500 5.2 8v stock gears with 35's lol 1997

RE: 5.9 and better fuel mileage what can i do
 

i bet u 10 dallers he has a open air filter and its very dirty killing his gas millage ;D The sound is it sucking air throw the odl and difty filter killing ur gas millage.

RE: 5.9 and better fuel mileage what can i do
 

I have a 96 350. Xcab short bed and i was getting 13 HIGHWAY!!. then i replaced the Pleneum plate and plugs ect. tune up and now get about 15-17 highway. footstomper yes and over 70. more like 75. 109K and spinning

RE: 5.9 and better fuel mileage what can i do
 

I found the best mod to do to get better gas milage outa the 360 is simply removing your foot from the petal lol. ahhhh who am i kidding its so much fun to make alota noise, im also averaging like 11.5 mpg lol, but i do zero highway driving.

RE: 5.9 and better fuel mileage what can i do
 

I believe he might have figured that out...3 years ago. Holy dead thread Batman!

RE: 5.9 and better fuel mileage what can i do
 

There are some vacuum lines under the battery that are famous on the 2nd Gen Rams for getting leaks due to fumes from the battery vents causing corrosion.

Another tricky to spot place is where the vacuum lines pass through the grommet from firewall into behind dashboard.

The 'blend door' of the heating and air conditioning system can also develop a vacuum leak that whistles inside the cab loudly.

Many MPG improvement ideas in a long read here:

https://dodgeforum.com/m_447500/tm.htm

RE: 5.9 and better fuel mileage what can i do
 

haha i didnt even notice it was 3 years old.

RE: 5.9 and better fuel mileage what can i do
 

damn.. yall suck.. i think i get like THREE mpg on mine.. its havin some big issues now tho.. shes pretty sick.. gonna have to tear into it and figure out what the deal is soon ..

RE: 5.9 and better fuel mileage what can i do
 

It happened again!

"Newbs" ;) Bringing back 3 year old topics lol

RE: 5.9 and better fuel mileage what can i do
 

lol this post started in 2004

RE: 5.9 and better fuel mileage what can i do
 

Is there a post on here somewhere that shows how to clean out the throttle body??

RE: 5.9 and better fuel mileage what can i do
 

Most here a taking off the TB - 10 minutes
Spraying it with carb cleaner - 3 minutes
Putting it back on -322 minutes or 11 minutes if you didn't lose anything or forget how to reverse the removal. :D
done.