Only getting 10-12 mpg with 4.7 ho

[joulian]

what is going on with this ? It runs smooth.

 

[Razzaa]

WTF REALLY!!!!! lmao I get 13mpg in the city driving my 5.7L like I stole it!!!!

 

[Bluesmoke91]

Clean air filter? Clean throttle body? Plugs changed? Are you stock wheel/tire?

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[Razzaa]

what is going on with this ? It runs smooth.

I just realized you have an 04.........a lot could be affecting your mpg. I would start the process of elimination.

 

[dodge dude94]

I'd say misfires or clogging cat.

 

[Bluesmoke91]

I'd say misfires or clogging cat.

He said it runs smooth. He'd probably be able to feel a misfire unless it is very intermittent or subtle.

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[joulian]

Cats are good , has new air filter. Engine has 390,000

 

[dodge dude94]

He said it runs smooth. He'd probably be able to feel a misfire unless it is very intermittent or subtle.

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It's amazing how sometimes you can't feel a miss. Especially on the 4.7s. My dad never knew he had a misfire on cylinder 3 until it finally threw a P0303 code. Number 3 plug died and it was barely firing.

Cats are good , has new air filter. Engine has 390,000

Sweet Jesus have mercy. With 390k, I'd be doing a compression and leak down test to see what the numbers are.

 

[toofart]

o2 sensors

 

[joulian]

i am thinking the computer on the visor is wrong , I reset it and its up at 12 mpg or 13 then after a day or two it settles at 9.8 the goes up to 10.5 then to 11 I don't get this thing.

 

[joulian]

no misfires. It has all new coils and plugs.I had codes read after and all. I am positive not misfire.

 

[LB3711]

Need to calculate by hand. Also are running stock tire size? If not your speedo and odometer will be off. That will change your mpg.

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[DHRam39]

Dang dude, I can't help you that much, but i would definitely re-do your mpg calculations. I've got an 06 1500 with the 4.7 with 48K and my in-truck average gauge reading is never totally right. All i've got is a K & N drop in and a Magnaflow muffler and the WORST i've ever got was 12.9 all city driving. Best was 17.3 on a roadtrip i did. I have an app on my phone that i track my fillups with too. Helps a ton and it's got a sweet little graph showing everything and an overall average!

 

[joulian]

OOOOH i did put 20 inch 2007 chrome 5 star rims on it .... I forgot about that . Did it the 2 nd day so its kinda like I never had those stock 17".

 

[WalterG]

I have 325/60/20 on mine and when I put them on my mileage went from 14-16 down to 11-12 on the highway and I get around 10 in town.

 

[reelop19]

Damn no wonder I've been thinking my mpgs were too low. I recently got my 07' 1500 and it came with SRT 22's.

 

[Bryant]

Dang dude, I can't help you that much, but i would definitely re-do your mpg calculations. I've got an 06 1500 with the 4.7 with 48K and my in-truck average gauge reading is never totally right. All i've got is a K & N drop in and a Magnaflow muffler and the WORST i've ever got was 12.9 all city driving. Best was 17.3 on a roadtrip i did. I have an app on my phone that i track my fillups with too. Helps a ton and it's got a sweet little graph showing everything and an overall average!

Hey man what's the name of that app? Cause I've got a single cab 06 with a 4.7 too. And I've noticed my mpg is way down on the overhead. I don't think anything is wrong, although I have been looking for a better way to track my mpg.

 

[Hemipower392]

I live where most of my miles are highway miles and I have an 07 4.7, if I really try I can 14 mpg, truck runs really really good and only 94000 miles