'08 Hemi 10mpg in city???? - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
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#1 Old 03-23-2013, 11:22 PM
NOLA 32/65
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'08 Hemi 10mpg in city????

I have a '08 single cab long bed Hemi with 71k miles that's getting what I consider horrible mpg. I've read and been told 13-16 is avg. I've even been watching how I drive to make sure I'm not in it too hard and that's when I averaged 9.8 mpg. Driving normal I'm probably down to 7-8 mpg.

Anyway, I haven't looked but I'm assuming my plugs and air filter needs to be changed so I plan on doing that. What else will get me back to normal mpg.

Also I'm about to do a search on this but what's the best air filter for these engines?

Thanks in advanced!
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#2 Old 03-23-2013, 11:32 PM
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I'm on my second HD Hemi and I am doing better than your truck. Looks to me like its time for the Hemi Tune Up for your truck.

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#3 Old 03-24-2013, 12:27 AM
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I just got my '08 Hemi about 2 weeks ago but its a quad cab 4x4. The worst I've seen is 10mpg but that was last night when I layed the pedal down for a few seconds just to see what it would do. Hit 90 in just a few seconds so I layed back off of it. But under normal driving conditions ( not babying the pedal but not dumping fuel either,) I normally get about 14mpg. I haven't checked the air filter yet or the plugs either. But I imagine replacing them could only help. I'm interested to see what the Hemi vets on here say that will help improve mpg.

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#4 Old 03-24-2013, 12:33 AM
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Once you do the tune-up find a place that sells 100% gas with no ethanol & pay the price for it. In the long haul...... it's much better for your truck and less problems down the road.

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#5 Old 03-24-2013, 12:47 AM
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Yea I'm not looking for crazy high mpg, just wanna get what I'm supposed to from factory or atleast closer.

I do have a couple of 100% gas stations around here, I didnt think they made that much of a difference.
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#6 Old 03-24-2013, 01:28 AM
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change plugs- big difference maker if ures are wore- air filter,fuel filter(if it has one) superchips 3865 programmers come cheap in the classified part of this forum. im also in new orleans pm me if ya need anything.

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#7 Old 03-24-2013, 02:55 AM
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The E10 just kills my mileage.


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#8 Old 03-24-2013, 09:45 AM
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How are you calculating mileage? The overhead is not the most accurate if you are constanly reseting it and then city driving. I get around 9-10, but I drive it hard and it has some decent performance mods done to it.


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#9 Old 03-24-2013, 09:54 AM
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I get about 11 when I beat on it but can pull close to 13.5 driving easy. Not sure how putting an after market cam is gonna affect it.

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#10 Old 03-24-2013, 10:44 AM
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Originally Posted by catman113 View Post
change plugs- big difference maker if ures are wore- air filter,fuel filter(if it has one) superchips 3865 programmers come cheap in the classified part of this forum. im also in new orleans pm me if ya need anything.
I didnt think programmers did much for gas engine trucks, thanks for the heads up! I'll let you know if I need anything.
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How are you calculating mileage? The overhead is not the most accurate if you are constanly reseting it and then city driving. I get around 9-10, but I drive it hard and it has some decent performance mods done to it.
I have a base model truck, I don't have the overhead gauge on the roof. I'm calculating the old fashion way, using math lol.
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#11 Old 03-24-2013, 11:08 AM
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I get about 11 when I beat on it but can pull close to 13.5 driving easy. Not sure how putting an after market cam is gonna affect it.
Exactly the same for me unloaded. My all-time worse is while towing; 7mpg hand-calculated.

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#12 Old 03-24-2013, 12:25 PM
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Im not sure how you guys are getting 13-14 city only... I average about 15 with 75percent highway and country driving. Im guessing im about 10 if i do city only
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#13 Old 03-24-2013, 04:06 PM
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My '07 was only getting about 10-12, but I had it leveled with a 3" BL (though I was running stock diameter tires). One thing I'm surprised nobody has asked is about rims/tires/lift. Are you stock height? Is it lifted/lowered? Is it leveled? Do you have larger than stock tires? Do you have wider than stock tires? These (and many other things) factor into your fuel economy.

It does sound like you need a tune up though. 8-9 is pretty bad unless you're running 35's or something like that.

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#14 Old 03-24-2013, 05:36 PM
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how much idling are you doing? That will really take a bite out of mileage

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#15 Old 03-24-2013, 06:04 PM
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I'm stock rims/height with 265-70-17s. I really don't do a lot of ideling that's not required as in drive threws and red lights.
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#16 Old 03-24-2013, 06:17 PM
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I get about 11 when I beat on it but can pull close to 13.5 driving easy. Not sure how putting an after market cam is gonna affect it.
Expect about 1- 2 mpg worse depending on the cam

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#17 Old 03-24-2013, 07:23 PM
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Im not sure how you guys are getting 13-14 city only... I average about 15 with 75percent highway and country driving. Im guessing im about 10 if i do city only
Agreed! Everyone always claims these great city numbers but even when I was stock and drove efficiently I only managed about 11.5 in the city. Now with my lift and tires I get all giddy when I see 9 or 10. My engine has fresh plugs, oil and air filter and it doesn't increase my mileage. So I really wish people would share their knowledge (and pictures) of how to get this great mileage.

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#18 Old 03-24-2013, 07:57 PM
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Expect about 1- 2 mpg worse depending on the cam
Comp 260. An yea I didn't expect to gain Mpgs

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#19 Old 03-24-2013, 07:59 PM
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Until I put the 4.56 R&P on the truck the best mileage I got was 11.5 on the highway and about eight in town.


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#20 Old 03-24-2013, 08:03 PM
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I even get better than 10 mpg....


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