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Fuel System All Fuel Discussions. MPG - Mileage - Fuel System Maintenance including Air Filter Replacement.


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  #1  
Old 10-23-2009, 04:12 PM
Alaskan7 Alaskan7 is offline
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Default Best way to improve fuel mileage 2500 hemi

I know that having a 2500 with a hemi, I shouldn't be too worried about gas mileage....But whats a good way to help it with the fuel consumption? Any good gas additives out there for this?
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Old 10-23-2009, 04:21 PM
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Gas additives are a waste of hard earned cash. As long as you run top tier gas, you will be doing the best you can. I would suggest a programmer, and CAI to start. Then, exhaust will free up more power and MPGs. Bigger throttle bodies help as well. Just be careful to not lose a lot of back pressure. With all that, you should be doing pretty well on hp, torque, and MPGs. If you want to pay the extra money, 91 octane has given me better mileage and power running it in my stock motor as well.
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Old 10-23-2009, 04:24 PM
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A good programmer believe it or not is a real good start . The programmer tweeks your fuel and spark curves . As long as you can behave yourself , you should see an improvement . Anytime you can free up intake and exhaust flow helps also . Cold air intake , headers , cat back /dual exhaust system . Good luck and let us know how you make out .
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Old 10-23-2009, 04:31 PM
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I agree with all the above with the exeception of using higher octane level of gas...using premium gas does not give better mpg, in fact it damages the engine...Im speaking for vehicles that are not recommended by the manufacturer to use premium...Using premium, unless recommended by the manufacturer, is as much a waste of money by using fuel additives from auto zone, and advanced auto...Now it may seem you have gained more mpg, maybe cuz you have lost more hp by using the premium gas...And yes, you can lose hp by not using the correct fuel in any engine...The best thing to do is, do the speed limit, keep a light foot on the gas pedal, and cruise control on the highways...
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Old 10-23-2009, 05:44 PM
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Yeah Chillz is right, don't use premium unless it is recommended. Not only is it more expensive, which negates the reason to get better mpg anyway, but it is slightly harder to burn, thus robs some power. The reason there is premium is for high performance engines with high compression ratios. It needs to be slightly harder to burn to prevent predetonation. So you don't need it.

To help get better mpg, get a intake, exhaust, programmer and an electric fan. Those will be a real good start.
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Old 10-23-2009, 05:44 PM
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Quote:
Originally Posted by CHILLZ HEMI View Post
I agree with all the above with the exeception of using higher octane level of gas...using premium gas does not give better mpg, in fact it damages the engine...Im speaking for vehicles that are not recommended by the manufacturer to use premium...Using premium, unless recommended by the manufacturer, is as much a waste of money by using fuel additives from auto zone, and advanced auto...Now it may seem you have gained more mpg, maybe cuz you have lost more hp by using the premium gas...And yes, you can lose hp by not using the correct fuel in any engine...
I have no idea how it would damage an engine. I have seen gains, felt gains, and that would mean that the 91 tune on a programmer is simply destroying your engine. 91 simply burns slower, if I remember. That would mean that power is being created for a longer period of time. I have heard both sides of the argument many times from experienced techs and Chrysler training videos, but in my experience I calculated a increase in MPG over an entire tank, in both vehicles I have owned. I drive the same few roads every day, and my habits never change. If anything, I was harder on the gas with 91. And I know a "butt dyno" isn't reliable, but mine tried to tell me I was going a bit quicker.
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Old 10-23-2009, 07:30 PM
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Great advice from all;


thanks guys, looking into all of that over the weekend.
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Old 10-23-2009, 07:45 PM
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Ok, you are right in saying that 91 octane burns slower, but it burns slower for high compression ratio vehicles, thats its purpose...High octane in a low compression ratio vehicle does in fact burn slow too, but decreases the engine performance and increases the work load of the engine...In case you do not know, the octane reading for fuel, ie 87,89,91,93, is a misconception to most people...By that i mean, most people believe, "im gonna put premium in my car cuz it has higher octane which will give me better mpg, and more hp", when in fact they are wrong...The numbers do not mean that the 91 fuel or 93 fuel is better to run than 87 for gains in mpg and hp...the numbers represent the resistance of fuel to knocking and pinging in any engine, which is where the fuel is not able to be burned off as normal, which can obviously damage your engine...So what happens when you raise the compression ratio on an engine??? Well, you in fact raise the chances to create knocking and pinging, which is why they have premium fuel with higher octane, which burns slower to ensure a smooth running engine...
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Old 10-23-2009, 07:48 PM
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I can tell you that if you lightly accelerate down hill and then coast up hills that will help. Also changing out the tranny, motor, front and rear differentials with quality AMSOIL Oils you will see a slight gain in MPG's and help the drivetrain last longer. Keeping the 265 series tires on there and aired up will also help lower your rolling resistance. Slow Down on the highway but go ahead and get up to speed will also help. Try to avoid gas stations that sell E10 Junk Gas.... This alone will gain you 3+ MPG guranteed .... The Ethanol that is being put in gas is a load of crap. Terrible MPG's, yet we are trying to save the Earth by burning less oil ..... HELLO..... If I get less MPG's with 10% E in the tank I will be filling my tank back up with that 90% Gas a 1/3 more ....... Ok... Remove any extra weight from the truck. Remove steps, grill guards, fender flares...... Lower the Truck...... Programmer set to MPG mode and a light foot..... Clean Air Filter, new plugs, wires, clean TB, Good Oxygen Sens's.... Having your rig towed UP HILL and you coast down
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Old 11-03-2009, 02:40 AM
Alaskan7 Alaskan7 is offline
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haha Great replies. Im not sure that my 35" Interco's help at all either. But i think that the bada** tires might be worth the couple miles per gallon. Ill start with a fuel programmer and see what else i end up with.. exhaust, intake, etc
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