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Old 02 Dec 2011, 08:17 pm
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Default My Civic isn't getting the mpg is says it should!?

I recently bought my first car, a 1995 honda civic ex coupe. It runs great, just overshifts gears sometimes. but it says it gets 32 mpg in the city and 41 on the highway. I'm only getting about 20 mpg. It has fuel, the tire pressure is right, not a lot of weight in the car. For every five gallons I put in, I get a little over 100 out. Just because the car is old doesnt mean that is lowers the mpg, does it? I need help because I bought it for the good gas mileage. Thanks















No Gas leaks, and I know it doesn't get what it says. I use this one website which is highly acurate because of it and its not even close. And I'm not very car savy. What do I need to do with fuel injectors and sparkplugs?















No Gas leaks, and I know it doesn't get what it says. I use this one website which is highly acurate because of it and its not even close. And I'm not very car savy. What do I need to do with fuel injectors and sparkplugs?
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Old 02 Dec 2011, 08:31 pm
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Needs a tune up. New spark plugs, maybe a new/better fuel rail or injectors.































Your mileage may vary, as they say, but it shouldn't vary that much. You sure you're not leaking gas out the bottom?
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Old 02 Dec 2011, 08:46 pm
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Those are under idea circumstances, and are a total joke. You will never get what the manufacture says the MPG are. And in lots of cases not even close.































And the 20mpg sounds about right for the car.
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Old 02 Dec 2011, 09:01 pm
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Fuel economy is 95% driver, 5% car. If you are not getting the fuel economy you should that is more than likely due to the loose nut behind the wheel. To improve your fuel economy you need to change your driving habits and style.































The EPA ratings you quoted were for a manual transmission BTW - the automatics got 25/33
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Old 02 Dec 2011, 09:16 pm
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One of the things I would check is the exhaust system. If there is a crack or other exhaust leak in front of the O2 sensor it lets in fresh air and the ECM tries to correct this by adding more fuel. I was told the most common problem on the Civics in this area is a joint between the down pipe and the rest of the exhaust system. A crack in the header might also be the cause.















The next think I would replace (trying to prove it bad takes more time then to just replace it) is the engine temp sensor that is connected to the ECM (ECU). If it is not reading right it will throw off the fuel map because the ECM thinks the engine is cold and using that fuel curve.















Fuel injectors rarely fail (at least that is my experience). But if you replace the spark plugs and know what to look for you can tell if the engine is running rich (http://www.diymyride.com/spark-plug-reading-593/). If they show a rich condition look for exhaust leaks.
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Old 02 Dec 2011, 09:31 pm
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for starters... you didn't say how many miles your civic has on it. You can bet that gas mileage is going to be different on a motor that has 60,000 from a motor that has 200,000.















32 MPG in a Civic ???? i suppose its possible - but not very realistic































Another thing that effects mileage is how well the motor was maintained in the last 17 years. If previous owners had changed the oil & filter regularly AND gotten repairs done, WHEN they needed it: the engine will stay healthy and trouble free. If they put things off until they are TOTALLY broken and it MUST to be fixed in order to be used.....well.......allll-righty then......































Another thing that effects mileage is your driving style. If you drive like a "bat out of hell" then your mileage will never be as good as it COULD be. Things like excessive speed.... frequent hard stops and starts.....making too many short trips (less than 1 mile).... keeping the transmission in a lower gear, just to hear the engine rev up......sitting in a parking lot with the engine running to keep the heater/air conditioner on while you wait for your GF to finish shopping. These are things that KILL gas mileage !!































The EPA rated the 95 Civic at between 23 to 35 MPG - depending on motor/tranny combo. I'll bet that you have the model with the 1.6 engine rather than the 1.5































http://fueleconomy.gov/feg/PowerSear...ic&srchtyp=ymm
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Old 02 Dec 2011, 09:46 pm
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when honda tested those cars they were going downhill with the wind so if you expect to get those exact mpg you are wrong.. your still getting good mileage so why are you complaining
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Old 02 Dec 2011, 10:01 pm
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there is nothing you can do to make a car that old get the gas mileage it did when new. to check your mileage fill the car up and write down your miles. Now drive about 200 miles and re fill. check the amount of fuel it takes to fill it up. Not in $$$ in gallons. Now take the miles driven divide by gallons you just put in.
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