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  #1  
Old 03-09-2011, 06:40 PM
Crusty128 Crusty128 is offline
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Arrow Inexplicable gas mileage !

Hi there,


I own a RAM 1500 2003, HEMI since 3 weeks.

I fill it with regular 87 in good gas station and my gas mileage without doing anything particular is about 28L/100km that's to say about 10 to 12 gallons per 100 miles!!!



Conditions :
-I drive it alone, no towing, nothing in the bed, I drive it most of the time in 4x2.
-I start the engine with my remote starter 5 to 10min before jumping in in order to let it warm
-No lift, no big tires ( 275/55/20, snow profile)
-CLEAN air filter.
-Right exhaust headers with a small small leak (can hear it when I give it throttle)
-Oil was replaced just 3 months ago I guess by the previous owner.
-The engine seems to work fine, no suspect noise, accelerate pretty good
-I have a tonneau cover
-I drive it really kindly because I'd like to know how much I could lower my gas mileage but I don't succed in at all ...
-I don't have any light in the dash board such as "check engine" or whatever...
-My A/C don't work "because of the Canister which need to be replaced", as the previous owner told me.


At 50 miles/h, my gas mileage already at 15L/100km !!

Don't know IF and WHEN my sparks were changed
Don't know if disconnect my battery would reset anything.

Please give me some help, my truck is making me mad and sad

Thank you !


EDIT: if needed for you http://www.convertworld.com/fr/conso...ar+100+km.html
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Old 03-09-2011, 06:52 PM
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well the 5-10 min warm up will put a big dent in your mpg ..
Also your running winter gas .. which isnt known to be great for your mpg ...

you have a 2003 with no idea if the plugs have been changed so if your good with this sort of thing .. get r done its due.

Check your air filter as well and replace.

AC not working wont affect your mpg if your not running it.
Also dont expect to get the numbers from your hemi that the new hemis can get as you dont have MDS system. Also I wouldnt take what you see in the evic or head up as being 100% accurate. try doing the manual calculation for a month or two and see what that gives ya.

your MPG are not that bad considering .
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Old 03-09-2011, 07:06 PM
Crusty128 Crusty128 is offline
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thank you for your fast reply, much appreciated

-My air filter seems to be NEW, it's VERY clean.
-When I watch some topics like "what kind of gas do you use to fill up your tank?" , I can see a lot of people that answer " the regular one (87) works great for me and I save a lot of money" and others answering "I give the best to my hemi, so I always go with supreme gas" ... so I don't know what to think.

-my winter tires are smaller than what they should be, so I can NOT imagine my gas mileage with the 35" I'd like to fit on later

-Do you think that with 8 NEW sparks ( with WHICH brand and model should I go ? ) , I would get a "descent" mileage ?
-Do you think I should change the coils too ? ( what brand ? )
-Do you think guys it could be a "hidden" default ? I mean a default that do not light on any cell on the dash ?
-Do you think I should start my engine just 1 min before to go?


To end, I calculate myself my gas mileage, and it is pretty the same as what the computer shows.

thank you !
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Old 03-09-2011, 07:15 PM
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all that idling is using a lot of fuel, but, your living in cold country & that is the price that you pay
you can buy a can of SEAFOAM & follow the directions, there are youtube videos on how to use it, don't put it in your oil until 200 miles before your ready to change oil
pull a spark plug or 2, to look at color & for rounded off electrodes
http://www.theultralightplace.com/sparkplugs.htm
you can also possibly pull off the spark plug wires, 1 at a time with the engine running, if when you pull 1 off, listen for an change in engine sound, if no change, it could be a bad plug or wire, put it back on & do the same with all the cylinders. i used that method on engines with ONLY 8 spark plugs or less
you could also check your throttle body for cleanliness inside
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Old 03-09-2011, 07:24 PM
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Ok, thank you !

Do you think too I should go at least with 8 new sparks ?

I will try the coil tip, I knew that tip but since my engine sounds really fine, I did not think that was necessary.

What is the aim of a SEAFOAM can? what about the result expected?

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Old 03-09-2011, 07:25 PM
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Also, do you advise me to go with a higher octane ? I can use 87/89/91 .
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Old 03-09-2011, 07:32 PM
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If you change the plugs, change all of them not just 8.
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Old 03-09-2011, 08:11 PM
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One thing, I believe Hemi recomends 89 octane, try running that for a while and see if you can save some money that way too... I dont think you will benifit from going with supreme just for daily driving ... allthough i can be way off ... You will happy to know you have 16 sparks to change .. heh same with the new 4.7's If you do them you might as well do them all especially if your doing the work.

The best way your gonna save mpg's is reduce the idling and of course staying staying off the gas when you can. You cant do to much about what it does if your already babying it. It is what it is ... A kick ass V8 with balls ... not a toyota hybrid.
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Old 03-09-2011, 08:11 PM
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your vehicle suggests 89 octane but you can use 87.your gas milage will be a little worse in the winter different additives in winter gas.also road conditions.your gas milage not much diffferent then mine i use 87 octane with synthetic in engine/royal purple in differential/new ngk plugs and wires.stock exhaust.38 litres gets me 150-170km.consistently in winter.9-12 mpg.all city driving which u did not mention what % city/hyway
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Old 03-09-2011, 08:51 PM
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First, get the exhaust leak fixed. A leak before the O2 sensors will trick the PCM into thinking the exhaust has too much oxygen in it and it will increase fuel to the cylinfers in an attempt to richen the mixture. Also, if the sensors haven't been replaced, a lazy sensor can also add to the problem.

The Hemi doesn't require it but it's recommended that 89 octane fuel be used. Using 87 octane can cause spark knock and the PCM will retard timing to compensate.

Cut back on your warm up times.

Check the condition of the plugs and replace them if they're worn. Do all 16 at the same time.

You didn't mention which gear set the diffs have. If you have the 3.92's those aren't going to help your economy any. If your truck is a quad, the extra weight will also take a small toll as well.


Resetting the PCM won't do you any good.

Changing the coils won't help fuel economy. There's no reason to replace them if they aren't bad.

You could possibly have stored codes in the PCM but anything that could cause poor economy would likely illuminate the MIL.

Finally, most people I know with trucks like yours average around 15 mpg, so you're not that far off the norm.
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