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Something is wrong with my truck. I get bad gas mileage

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  #41  
Old 06-29-2011, 11:42 AM
C.W.S. C.W.S. is offline
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I usually get around 14mpg...i actually got 15mpg about a week ago, and I dont drive like a grandma but i dont go WOT all the time. 1996 Dodge Ram 1500 SLT Laramie Sport 5.9L 360ci. But these trucks are not the best for max fuel economy.
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  #42  
Old 06-29-2011, 02:23 PM
Dodgeaaron Dodgeaaron is offline
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hey you, yes its smoky with a hint of gray, and smells like gas , do i have a map sec / and sense-er that needs 2 b replaced>?
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  #43  
Old 06-29-2011, 02:54 PM
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Getting any codes?
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  #44  
Old 06-29-2011, 03:39 PM
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yea i got around 12mpg with my 1994 ram 5.2l with 87 octane gas, i started using 89 to see if there was an improvement, and i installed a 40 series flowmaster muffler because the old one was rusting through, and i noticed an 2.5mpg gain, i regularly get 14.5 mpg at fill up with 89 octane gas, i dont run wide open alot but i dont exactly baby it, i got a Sheetz gas card for graduation and put high grade 92 octane in it, it got up to 15.5 but im sure high octane at shell or something would be better cuz sheetz gas is ****. And yea the guy that talks about driving techniques is right, i pretty much drive like him and get decent mileage.
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  #45  
Old 06-29-2011, 07:25 PM
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8.5 every time. I would be happy with anything in the double digits.
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  #46  
Old 06-29-2011, 07:55 PM
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8.5 every time. I would be happy with anything in the double digits.
Gotta be something wrong there. Even I can get 12 or so around town, and thats with a 3/4 ton and a 360.
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  #47  
Old 06-29-2011, 08:01 PM
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Gotta be something wrong there. Even I can get 12 or so around town, and thats with a 3/4 ton and a 360.
Huh? Do you drive it or get out and push it around town?
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  #48  
Old 06-29-2011, 08:04 PM
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Huh? Do you drive it or get out and push it around town?
I actually do drive it. I wouldn't be able to push the damn thing downhill......
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  #49  
Old 06-30-2011, 02:24 AM
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Quote:
Originally Posted by mackbarr1014 View Post
8.5 every time. I would be happy with anything in the double digits.
I concur with HeyYou. Something definitely wrong.

My truck isn't that dissimilar from yours. Super 44, 52mm TB, kegger mod. With just that combo, before the tuner and e-fans, I'd get about 11-12 in town, and I drive with a lead foot.

You should be a few MPGs into the double digits, even with a lead foot. How many miles do you have? If anywhere near 80k, have you replaced the front O2 sensor?
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  #50  
Old 06-30-2011, 06:41 PM
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Yea I just broke 70,000 the other day. I do drive with a heavy foot every once and while but something is not adding up. Just added Mobil 1 synthetic. I had a toolbox with a lot in it but I took that out to see if it made a difference. The air filter is clean, no check engine light, good on oil, all exhaust pipes look good definitely no rust, tire pressure is at 35. Anymore money going in my truck will be the o2 sensor, tune up, and 14x3. I've done a lot of reading on here and I don't think anything else would have an effect on it. But hey a wise man once told me that the best gas saving device is a locking gas cap.
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  #51  
Old 06-12-2012, 06:20 PM
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Ok so after reading all 5 pages I have an idea of what it could be but im gonna ask anyhow.

I 0have a 01 1500 5.2 magnum. Before I gave it a tune up (oil, wires, plugs, and filter) and added new back tires 265/75/16 (supposed to have 245/75/16 wanted a taller tire to fill fender wells out back)I was getting 310 to a tank. I noticed today that I am at 245 with less than a 1/4 left. I figure 265-285 now will know in 2 days. I was at 198 when I hit a half a tank. 75.00 to fill it full at 3.18 a gallon. I had an evap issue last month and spent $75.00 on a frakin filter/diagnostic to fix that issue.

I don't drive like an old lady and I don't dog it like a kid would either.

Now the question is why is it getting worse and doing it after the tune up?


CTPAFW163 How hard was it to adapt the air cleaner to your rig? Any changes in performance?
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  #52  
Old 06-12-2012, 07:11 PM
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A 2001 has a deathflash , when I removed it it was a totally diffrent truck . It's like someone took a 5k ancor off the end of my truck
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  #53  
Old 06-12-2012, 07:16 PM
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You have bigger tires.

Any bigger tires will demolish your everything with the puny 3.55 gears
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  #54  
Old 06-12-2012, 08:29 PM
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A 265 tire isn't significantly larger than a 245. And measuring mleage by 1/2 tank or any gauge is not even close to accurate (lucky to be within 15%-20%). Measuring actual miles and gallons is the only way to be even close.

And death flash would possibly impact it, but should not be any different form before changing tires.
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  #55  
Old 06-12-2012, 10:00 PM
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Just like everybody else on here I want better mileage, even 1 mpg is better than nothing. I'm hoping to achieve this by doing my plenum with hughes, changing my spark plugs (haven't been done in awhile, wires, rotor and cap have been done within the past few years) cleaning the IAC, slapping on a new MAP and changing the front O2. Does that sound ridiculous? When I got my truck 8 years ago, it was getting so close to 15mpg, now its down to 11-12.5ish...maybe it's just getting tired with 144xxx... So for me, thats bad considering what it was getting.
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  #56  
Old 06-12-2012, 10:23 PM
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Skip the MAP sensor, go for the pre-cat O2 sensor. Also deal with the cat....
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  #57  
Old 06-13-2012, 02:10 PM
Shaggy433 Shaggy433 is offline
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Just did a 500 mile round trip run this past weekend and got 15.18 mpg on the highway.. No a/c and cruise set at 74...not too bad i suppose..i average 11.5-13 in the city since i replaced the motor back in march...
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  #58  
Old 06-13-2012, 03:20 PM
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Quote:
Originally Posted by gdstock View Post
....... measuring mleage by 1/2 tank or any gauge is not even close to accurate (lucky to be within 15%-20%). Measuring actual miles and gallons is the only way to be even close.

And death flash would possibly impact it, but should not be any different form before changing tires.
You kinda mis understood me I am measuring by a full tank so full it spit up. I mentioned the half tank to let you know that it drops faster than running on a fuller tank, why I do not know it just does. Right now I am at 262.5 and have a 1/8th of a tank left.

An what is a death flash? An how do I remove it?
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  #59  
Old 06-13-2012, 04:53 PM
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Quote:
Originally Posted by chromed95 View Post
Just like everybody else on here I want better mileage, even 1 mpg is better than nothing. I'm hoping to achieve this by doing my plenum with hughes, changing my spark plugs (haven't been done in awhile, wires, rotor and cap have been done within the past few years) cleaning the IAC, slapping on a new MAP and changing the front O2. Does that sound ridiculous? When I got my truck 8 years ago, it was getting so close to 15mpg, now its down to 11-12.5ish...maybe it's just getting tired with 144xxx... So for me, thats bad considering what it was getting.
8 years ago we didn't have 10% performance robbing ethanol in the fuel. Around town I get 8.5 winter/9.5 summer, Hwy about 14.5 winter/ 15.5 summer.
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  #60  
Old 06-13-2012, 07:10 PM
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Quote:
Originally Posted by bent-fender View Post
You kinda mis understood me I am measuring by a full tank so full it spit up. I mentioned the half tank to let you know that it drops faster than running on a fuller tank, why I do not know it just does. Right now I am at 262.5 and have a 1/8th of a tank left.

An what is a death flash? An how do I remove it?
Death flash was dodges answer to an engine that didn't have a knock sensor, and exhibited lots of spark knock.... so, they reprogrammed the PCM to pull timing. (thus, eliminating spark knock, but, also robbing power.)

To get rid of it, get a tuner from Hemifever Tuning. (he is a member here too...) 265 for three canned tunes, 365 for custom. Canned tunes will be fine for a stock truck, with just bolt on mods.
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Old 06-13-2012, 07:10 PM
 
 
 
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