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post #1 of 23 (permalink) Old 10-12-2003, 09:24 AM Thread Starter
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gas mileage improvements??

i have a 93 chrysler intrepid with the 3.3
i have owned the car since feb. 03 and i have put on 20,000kms
and the car currently has 177,000kms around 100,000 miles i think
i am looking to see if i am getting the most out of a tank of gas that i can which right now seems to be about 400kms in the city
it has new O2 sensors and i changed the plugs and wires when i got the car and i have changed the oil every 3000kms and it has a new air filter now i am not getting any codes but would replacing the egr valve help out on mileage or does 400km on a tank in the city seem decent for this car
and what else could help out on gas mileage even if not showing any codes?
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post #2 of 23 (permalink) Old 10-12-2003, 12:42 PM
 
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Kyle, you don't say how many gallons/liters it takes to fill your tank when you've traveled the 400 klicks so we don't know your average mileage per tank. At 18 gallons capacity you would be getting 13.8 mpg but you would be filling the tank before it was empty so you are getting better than that which is not bad for a heavy car in city driving. My city driving is done in Chicago which means a lot of stop and go (more stop than go) driving and I would think that 13.8 mpg would be great. I have a 92 Caravan with the 3.3 and A604 tranny and get about that kind of mileage in city driving. Proper tire inflation and a light foot on the gas pedal is about all you can do to keep the mileage reasonable in city driving. Just my $0.02

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post #3 of 23 (permalink) Old 10-12-2003, 12:52 PM Thread Starter
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i usually go by the gas gauge which isn't that acurate but i get 100kms between each of the quarter marks so that is why i said about 400km to a tank

i remember reading something awhile back on here that someone had changed their egr valve and it increased the gas mileage but i forget whether or not he was getting the error code for it
because when i got the car my egr transducer was melted abit and wasn't hooked up so i replaced just the transducer but when it was unhooked it never gave the error code this is why i am asking if it might help a bit.
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post #4 of 23 (permalink) Old 10-12-2003, 05:51 PM
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You are not understanding what FredB is saying.

You can go 400km per tank and putting in 40L and which is 10L per 100km which is acceptable for city or you can drive it 500km but only have 3 litres left in the tank which requires you to put 50L in the tank. Same mileage.
So to answer your question, how many liters are you putting in the tank each fill up?
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post #5 of 23 (permalink) Old 10-13-2003, 12:28 AM Thread Starter
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i'll keep an eye on it for the next few times i fill up then i will let you know the results
thanks
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post #6 of 23 (permalink) Old 10-13-2003, 12:38 AM
 
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check tire pressures and wheel alignment as well as overall tranny function including the torque converter.

Last edited by '98-ESer; 10-13-2003 at 01:24 AM.
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post #7 of 23 (permalink) Old 10-13-2003, 03:23 AM
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A good way to get better gas milage is to keep the gas pedal off of the floor. Duh!
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post #8 of 23 (permalink) Old 10-13-2003, 11:25 AM
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proper tire pressure will make a big difference, also what gas you use.....some gas stations use a 10% ethanol mix with thier gas.....the gas is cheaper but you will get a slight drop in mileage than using the 100% gas....
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post #9 of 23 (permalink) Old 10-13-2003, 11:54 AM
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This is VERY wrong. Ethanol not only burns more completely than 100% gasoline, but it has more natural lubricating elements in it that extend the life of your injectors and pump. It also keeps your fuel system very very clean.

The main gripe with ethanol blended fuels is because of their cleaning properties. Ethanol will dissolve water and clean out your entire fuel system including anything built up in your tank. The crap in the tank makes it's way to the filter and very quickly clogs it. Run ethanol blend for 2-3 tank fulls, allowing it to get as close to empty as you are comfortable with, then change your fuel filter. Also, if you run ethanol blended fuels, then you basically never have to run a fuel system treatment. Read any fuel system treatment bottle and it will list ethanol as a main ingredient!

I run Sunoco fuel in my car ever other fill up. However, when I first started running it I did notice a decrease in mileage and was instructed to change my filter after the first couple of tanks. As stated above, the ethanol has NOTHING to do with fuel mileage drop, it is the crud that the ethanol releases from your tank clogging the fuel filter that causes a decrease in fuel mileage and performance.

I am getting around 24 mpg on my 50 mile (on way) commute and that is with ~20 miles of sufface streets with 13 stop signs and 3 traffic lights and ~30 of NYS Thruway @ 80 mph. And my 'trep is no spring chicken at 161,xxx miles and nothing major done to the engine, EVER. So don't go saying ethanol blends decrease fuel mileage.

Kyle

1994 Intrepid ES - 3.5L w/ 167k miles - SOLD 04/01/04 for $2200 - Man do I miss it!

Last edited by swartlkk; 10-13-2003 at 11:59 AM.
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post #10 of 23 (permalink) Old 10-13-2003, 03:07 PM
 
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In the Chicago area we get nothing but 10% ethanol fuel. My 92 Caravan 3.3L runs fine on it but I do notice an increase in mileage when I get 100% gasoline on trips out of the Chicago area. I notice the same when I take the 95 LHS out of the area and get 91+ real gas. Ethanol has about 70% of the energy content of gasoline so the mileage using a 10% ethanol fuel should be less. Just my $0.02.

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post #11 of 23 (permalink) Old 10-13-2003, 03:27 PM
 
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Quote:
Originally posted by swartlkk
This is VERY wrong. Ethanol not only burns more completely than 100% gasoline, but it has more natural lubricating elements in it that extend the life of your injectors and pump. It also keeps your fuel system very very clean.

The main gripe with ethanol blended fuels is because of their cleaning properties. Ethanol will dissolve water and clean out your entire fuel system including anything built up in your tank. The crap in the tank makes it's way to the filter and very quickly clogs it. Run ethanol blend for 2-3 tank fulls, allowing it to get as close to empty as you are comfortable with, then change your fuel filter. Also, if you run ethanol blended fuels, then you basically never have to run a fuel system treatment. Read any fuel system treatment bottle and it will list ethanol as a main ingredient!

I run Sunoco fuel in my car ever other fill up. However, when I first started running it I did notice a decrease in mileage and was instructed to change my filter after the first couple of tanks. As stated above, the ethanol has NOTHING to do with fuel mileage drop, it is the crud that the ethanol releases from your tank clogging the fuel filter that causes a decrease in fuel mileage and performance.

I am getting around 24 mpg on my 50 mile (on way) commute and that is with ~20 miles of sufface streets with 13 stop signs and 3 traffic lights and ~30 of NYS Thruway @ 80 mph. And my 'trep is no spring chicken at 161,xxx miles and nothing major done to the engine, EVER. So don't go saying ethanol blends decrease fuel mileage.
Ethanol has a lower energy density than Gasolene does.. and even the car manuals say that the 85% ethanol fuels will give significantly less mileage than regular gas (I read this in a 2003 FFV stratus manual). If 85% ethanol has less mileage, so will 10% ethanol. that is just common sense.

Also.. ethanol is NOT a natural lubricant. Ethanol is just that. Ethanol: CH3CH2OH. As all Alcohols are, they are good cleaning agents, and kill bacteria. they are also Clean burning, and not considered "explosive" (they burn slower than gasolene). It is Harsh on Rubber and organic materials (like paper in fuel filters), and cause plastics to become brittle (as in the parts in your fuel injectors) Ethanol also can be harsh on certian types of metals, due to that little oxygen hanging off one end. (this can cause problems on piston rings and when it gets in by the oil due to blow-by).


I have experiance with this ethanol blend.. as the gas in Eau Claire doesn't have ethanol, and the gas in Milwaukee has ethanol. there is a very noticeable difference in mileage.. being upwards of 5% (1-2 mpg).

What you say about ethanol that IS good, is that it does allow water to mix with gasolene, and be "burnable" by the engine without causing it to stall out. This is great for us in the north because every so often the cold weather causes condensation in our gas tanks.
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post #12 of 23 (permalink) Old 10-13-2003, 04:55 PM
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indeed, both of my vehicles get worse mileage and run worse on 10% ethanol. i can do upwards of 20mpg in town on 100% gas and i usually go down to about 17-18 on the 10% blend.
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post #13 of 23 (permalink) Old 10-13-2003, 07:22 PM
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Yes, I got my facts wrong, ethanol does nothing for lubrication, however, my experience with 10% ethanol blends has been opposite. And just because a fluid has a lower energy density doesn't mean that it will not perform as well. Gasoline does not burn as complete as ethanol. It is based on the cross-linking between the hydrocarbon chains. 10% ethanol blended fuel will release fewer emissions. As far as it effecting the rubber components of the fuel system, many people say that it is bad, but just as many say that it is no worse than gasoline.

Ok here's the background before anyone jumps on my back about it. I drive a 50 mile one way commute. I fill up at Sunoco and drive for 3 days (300 miles). Fill up at a Mobil station and drive for 2 days (200 miles). I drive the same roads everyday. Nothing changes from day to day or week to week. I have been comparing my mileage over the past few months.

When I fill up at Sunoco (after running 200 miles on a tank with 1/2 Mobil 100% gasoline and 1/2 10% ethanol blend), I put in ~8.4 gallons which figures out to be ~23.9 mpg.
When I fill up at Mobil (after running 300 miles on a tank of 3/4 10% ethanol blend and 1/4 100% gasoline), I put in ~12.4 gallons which figures out to be ~24.3 mpg.

I fill up at 2 different stations because of the gas sales that they have. I can make it through an entire week on gas sales paying ~$1.65/gallon when normal is ~$1.77/gallon for 89 octane.

If you only run ethanol blends once and awhile, then you will indeed get worse mileage. When you run it more consistantly, you will start to see the mileage go up.

Kyle

1994 Intrepid ES - 3.5L w/ 167k miles - SOLD 04/01/04 for $2200 - Man do I miss it!

Last edited by swartlkk; 10-13-2003 at 07:24 PM.
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post #14 of 23 (permalink) Old 10-13-2003, 08:22 PM
 
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All I know is, that vehicles that take 85% ethanol (FFV) get MUCH less gas mileage on the 85% stuff than they do with straight gas.

Why would 10% atcually help?
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post #15 of 23 (permalink) Old 10-14-2003, 10:54 AM
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The whole point of E85 is to reduce emissions. Only Flex Fuel Vehicles can run E85, but even just a 10% blend has been show to reduce emissions enough to make it worth while.
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