5.9 and better fuel mileage what can i do
Thread Starter
Joined: Nov 2004
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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
Rookie
Joined: Nov 2004
Posts: 55
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From: so cal, NJ, NC
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
Hall Of Fame
Joined: Jun 2004
Posts: 12,484
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From: New Hampshire
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
oh yeah 60k on the clock
Veteran
Joined: Nov 2004
Posts: 334
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From:
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.
Joined: Aug 2004
Posts: 1,632
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From: LeRoy, Mi
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.
Hall Of Fame
Joined: Jan 2004
Posts: 12,946
Likes: 309
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...
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