Bad gas mileage.. How do I get better MPG - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
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post #1 of 33 (permalink) Old 03-17-2010, 07:10 PM Thread Starter
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Sad Bad gas mileage.. How do I get better MPG

I have a 2001 SE Intrepid and I think it should be getting alot better gas mileage than I am. I get right around 250 Miles on a Full Tank of gas. I'm not sure how big the tank size is, I believe its 13 gallons??? If thats the case then I get 19 miles per gallon. That just seems really low to me. I always make sure my tires are at proper air pressure and make sure my air filter is clean/new. What can I do to improve my gas mileage? Maybe, new spark plugs, ram air intake????? Hope someone can help me out. Thankyou kindly.

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post #2 of 33 (permalink) Old 03-17-2010, 07:20 PM
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Spark plugs....pcv valve....new fuel filter.....drop some RXP in your gas tank...that should get you on your way.
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post #3 of 33 (permalink) Old 03-17-2010, 07:24 PM
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Not sure about 2nd gens, but first gens have 18 gal. tanks. To add to the list: spark plug wires if they are old, make sure your tires are balanced and alignment is okay, and maybe change your driving style if possible. If you are an aggressive driver, easier acceleration and deceleration help too. The less weight in your car, the better.

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post #4 of 33 (permalink) Old 03-17-2010, 07:50 PM
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You are not telling us what kind of driving you do. Is it all stop and go city, is it highway, it all makes a difference.

My 2.7 gives me an average of about 28 mpg, and I drive about 70 % highway, the rest city. Generally I get about 100 miles per quarter tank on average. Straight highway driving nets me low 30's mpg's.

Check the simple things like tires, filters, plugs etc. The O2 sensors can degrade over time and decrease your mpg's as well.
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post #5 of 33 (permalink) Old 03-17-2010, 07:56 PM Thread Starter
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I would say I am an aggressive driver so I know I can calm it down and take it easier. My driving is 40% highway and 60% city. I will try the valve and the plugs and see if it gets any better. If anyone knows how many gallons the 2001 intrepid fuel tank is then please tell me. Thanks for your help
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post #6 of 33 (permalink) Old 03-17-2010, 08:00 PM
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Quote:
Originally Posted by Jshaworth24 View Post
I have a 2001 SE Intrepid and I think it should be getting alot better gas mileage than I am. I get right around 250 Miles on a Full Tank of gas. I'm not sure how big the tank size is, I believe its 13 gallons??? If thats the case then I get 19 miles per gallon...
The size of your tank is not part of the calculation of miles per gallon. You divide miles traveled since last fillup by gallons (as indicated by the gas pump) to refill.

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...To add to the list: spark plug wires if they are old,...
FYI, 2nd gens have no spark plug wires.
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post #7 of 33 (permalink) Old 03-17-2010, 08:13 PM Thread Starter
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okay, I thought I could just divide miles traveled by gas tank size. In anyones opionion is there a big difference in Spark Plugs? whether they are cheap or expensive, if one is better then the other? I am a newbie so i'm trying to get into my car and do different things to it.
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post #8 of 33 (permalink) Old 03-17-2010, 08:36 PM
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okay, I thought I could just divide miles traveled by gas tank size. In anyones opionion is there a big difference in Spark Plugs? whether they are cheap or expensive, if one is better then the other? I am a newbie so i'm trying to get into my car and do different things to it.
My understanding is the best plugs to use in the 2.7 are the stock recommended plugs. Someone feel free to correct me on this.

I always calculate my mpg's by resetting my trip meter to zero at fillup, and on the next fillup just divide what was on the trip meter by the gallons put in. I always set my meter back to zero at every fillup. Got in the habit with an older Grand Cherokee I had a few years ago that had a dodgy fuel guage. I also drive like I have an egg between my foot and the pedal because I had a Ford F150 with a 351 in it that got around 11 mpg's. I sold that thing last year, my Trep feels solar powered in comparison. My Grand Cherokee averages around 18 mpg's when I drive it. My leadfoot wife averages 14 in the same vehicle.
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post #9 of 33 (permalink) Old 03-17-2010, 10:31 PM
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Not that it matters much, but it is a 17 gallon tank on the 2nd Gen's.
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post #10 of 33 (permalink) Old 03-17-2010, 11:46 PM
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FYI, 2nd gens have no spark plug wires.
One less thing to worry about then.
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post #11 of 33 (permalink) Old 03-18-2010, 01:31 AM Thread Starter
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Well if is a 17 gallon tank then my fuel guage is wrong. Because when I let the fuel guauge needle get down to almost the red line, I fill it up again. I just my gas tank tonight and topped it off and I put in 13.5gallons of gas. So that means the tank still has 3.5 gallons left in it. One thing I have also noticed is that when the fuel guage is extremely low my "fuel light" is never on. I had the brand new fuel pump put in the car about 6 months ago, so maybe he didnt reset or messed up the fuel float. I guess I can test it by running the car out of gas and seeing where the the gauge needle is and see how many gallons go in when I fill it back up. And thnkyou to the others about the spark plug recommendations. everything is greatly appreciated.
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post #12 of 33 (permalink) Old 03-18-2010, 02:19 AM
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So maybe your mileage is not really as bad as you'd thought, hopefully. I get about 19mpg overall regularly on my '01 R/T and I drive fairly aggressively.
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post #13 of 33 (permalink) Old 03-18-2010, 10:36 AM
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FWIW my red line on the fuel gauge leaves me with about 2.5-3 gallons. So that's normal. If the gas light ever comes on, you better get your butt to a gas station. Mine came on and the next thing i knew i was on the side of the road.
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post #14 of 33 (permalink) Old 03-18-2010, 10:53 AM
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Spark plugs....pcv valve....new fuel filter.....drop some RXP in your gas tank...that should get you on your way.
New fuel filter would involve changing the entire fuel pump on these cars...
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post #15 of 33 (permalink) Old 03-18-2010, 10:56 AM
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When my '02 had a 2.7 in it, I would get about 23 in town, 26 hwy.
Now with the 3.5 HO I get 22 town, 24.5 hwy.
My current commute is 67 miles one way, about 10 miles town rest is highway. The 24.5 is the average from the last 12 tanks.

(There is a definite difference in acceleration with the 3.5)
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