Fuel Economy - Page 3 - Honda Civic Forum


Fuel, Oil, Cleaners & Other Maintenance Extending the life of your Civic requires the proper fuel, oil, and cleaners, along with other regularly scheduled maintenance.

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Old 06-28-2004   #61  
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UPDATE: Well, I had Honda do the 20k mile service and they couldn't find anything wrong. However, they did replace the air filter.

I drove 250 miles highway without the AC and got 36mpg. This time I did 75mph the whole day.

I drove another 250 miles highway WITH AC, we'll find out today how I did. The needle is just a little below 1/2, so it's looking promising.
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Old 06-30-2004   #62  
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02 Civic EX Coupe 5spd.

461 - 482 a tank with Chevron 95 Octane

Own3ed

-Lisa.
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Old 06-30-2004   #63  
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man...20mpg?? that's crazy ..danyumm
I'd just take it to the dealer right away instead of spending money on some aftermarket stuffs since you got 04.
by the way, I drive on 17's , a 12" subwoofer , exaust, Injen CAI.
I still get around 31-33mpg on City+highway
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Old 06-30-2004   #64  
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whoo best km/L yet I got 640km. This is after getting my cat back installed.
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Old 07-01-2004   #65  
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my 04 LX is 1,700 miles old and ever since I got the car, I averaged 32mpg city/highway. I shift at 4K RPM and no passengers. I changed to 215/45-17, lowered the car, occasional A/C and the mpg is the same. I get 35mpg city/highway when A/C is not being used.

I wonder how prominencecivic measures his mpg.
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Old 07-02-2004   #66  
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dude 22mpg even for an AT is crazy, i mean the worst i've gotten is 27 with hard all the way, best is 34.5 right now, i really doubt getting 38 ever but i'm fine with the 33 i avg now
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Old 07-02-2004   #67  
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I dont know I have seen people getting 450 miles a tank, then some with 200 miles a tank, I get about 330-350 which I dont think is good
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Old 07-02-2004   #68  
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I hit right around 400 miles/tank...usually 398 to be exact before i get real scared and just p-ussy out and fill back up
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Old 07-02-2004   #69  
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My car is like new with all fluids and filters replaced and I still only get around 22mpg driving normal below 4k rpms.
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Old 07-02-2004   #70  
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See, you cant measure the mpg by almost emptying the gas tank. Theres a method posted by another member on how to measure your MPG.

To refresh:

1. Fill up the gas tank.
2. Reset Trip-meter to zero.
3. Drive 'til you see the gas needle at half tank position at least. (i.e. 215miles)
4. Pump gas 'til it clicks (i.e. gas pump reads 6.6 gallons)
4. 215.4 miles / 6.6 gallons = 32.63MPG

I try not to let the gas needle go below half a tank. I usually filler up as soon as I see the needle on that position to easily measure the mpg. I know when I hit 200 miles on the trip-meter and the needle is at half a tank, I am getting at least 30.30 mpg.
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Old 07-02-2004   #71  
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There are many combinations why you are getting low mileage. The engine is not getting enough oxygen to burn the fuel, low coolant, rust particles in coolant, pressure wash radiator every year, radiator thermostat not opening/closing correctly, change air filter, change oil, change trasmission fluid, make sure all belts are tight with some gap, clean injectors/carbs, fuel filters, change spark plugs if burnt....

These are only some maintenance that is require during the schedule.
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Old 07-02-2004   #72  
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Don't forget if you have big, heavy wheels and wide tires that's going to kill your mileage as well. A different overall wheel/tire diameter will change your trip-meter's accurancy on top of this. Forget about additives and go drive your car hard more often, blow out all that buildup you made by granny driving all the time.
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Old 07-05-2004   #73  
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2004 LX Coupe 5-spd

Quote:
Originally Posted by Sickboy
Don't forget if you have big, heavy wheels and wide tires that's going to kill your mileage as well. A different overall wheel/tire diameter will change your trip-meter's accurancy on top of this.
Well, I just to San Diego from Los Angeles which is 200miles approx. I have one passenger. My 2004 LX Coupe 5spd set-up:

215/45-17 and each wheel/tire is 42lbs. Cold tire pressure is 36psi front and 34psi rear. Gasoline is the 76 brand on 87 octane. Occasional A/C, with bumper to bumper traffic on the interstate freeway for like 30miles total. Average speed is 70mph. Car is barely in 2,000 mileage.




















42mpg I am so not regretting trading my 2003 WRX with this LX when it comes to mpg
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Old 07-05-2004   #74  
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I can't believe that. My car is stock, 15" alloys LIGHTER than the factory steelies, all new fluids and filters, lots of maintenance, and driving around shifting below 4k rpms most of the time. I have a single sub and amps, but the spare tire is removed to counteract that. I just don't understand!

Oh and Honda says the fuel filter is inside the tank and can't be replaced. It's supposed to last 100k miles or more at least.
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Old 07-05-2004   #75  
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Setup: 03 LX Auto - stock but for floormats, windshield wipers, and soon to be installed speakers...probably going to pull the spare soon too. I drive almost all highway and I avg 32-35 MPG, probably trip odo about 395 between fills.
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Old 07-06-2004   #76  
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Quote:
Originally Posted by 518
42mpg I am so not regretting trading my 2003 WRX with this LX when it comes to mpg
Heavier wheels are better for keeping your momentum on the freeway, especially using cruise control. The best I got completely stock was 40.5mpg on my way home from Colorado, with 3 people and full trunk. But, light wheels are still better MPG in the city, not to mention better handling and braking. I should have been more specific.
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Old 07-06-2004   #77  
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Ok, I have just reached my half way mark and I am at 155 miles. WTF. Maybe I need to have my engine cleaned or my fuel system. Getting the fuel injection service. What do you all think.
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Old 07-06-2004   #78  
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Quote:
Originally Posted by Sickboy
Heavier wheels are better for keeping your momentum on the freeway, especially using cruise control. The best I got completely stock was 40.5mpg on my way home from Colorado, with 3 people and full trunk. But, light wheels are still better MPG in the city, not to mention better handling and braking. I should have been more specific.
Now that makes more sense.
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Old 07-07-2004   #79  
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heh averaged 35 finally, aiming for 37 next
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Old 07-07-2004   #80  
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Quote:
Originally Posted by streetglower
Ok, I have just reached my half way mark and I am at 155 miles. WTF. Maybe I need to have my engine cleaned or my fuel system. Getting the fuel injection service. What do you all think.
How many miles on the car, how long since last oil change, and AT or MT?
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Old 07-07-2004   #81  
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69,700, Auto transmission, I just changed my oil at 69,500. I added that Engine restore and lubricant to the oil, but that shouldnt affect it. I also just changed my spark plugs with NGK
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Old 07-09-2004   #82  
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I usually get 35 mpg with chevron. I also have 18 inch rims. I do city and highway driving and dont drive hard.
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Old 07-10-2004   #83  
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for anyone who's getting crappy fuel economy, have you tried resetting the ECU to make it relearn the idle?

ECM/PCM idle relearn procedure:
-Make sure all electrical items are turned off
-Start engine. Hold engine speed at 3000RPM until radiator fan goes on.
-Let engine idle for about 5 minutes with throttle fully closed and all electrical items turned off.
*NOTE: If radiator fan comes on during this step, the time it is operating must not be included in the 5 minutes.
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Old 07-10-2004   #84  
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Well the ecu is adaptive and learns when you drive. After burning a tank of gas, it should be optimized for greatest fuel mileage.
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Old 07-10-2004   #85  
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I have the same problem as you, gearbox. I get around 23-25mpg tops, however I am doing 80% city driving, so I suppose that I am getting good mileage. All highway, however, it will not go much higher. I have gotten 26.5mpg with about 70% highway driving, 30% city.

When I first got the car (after my sister, that is) I would constantly be pushing it to catch up to my friends who drove V8 mercedes and I6 BMWs. That would explain my 18mpg.
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Old 07-11-2004   #86  
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With mostly highway driving, I just got 37mpg. I'm shocked and it's either due to the new head, injector cleaner, HVS, or maybe all three. I think the greased lightning cleaner really helped.

However, my mpg is still low in the city like yours. Around 22-25 usually.
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Old 08-11-2004   #87  
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MPG....... HA!!!! i think im doing pretty bad.... im only averaging about 255 miles a tank..... thats city and highway..... am i doing somthing wrong, i dont gun the car, i have even drove it like a old lady w/o AC and my tires are at ideal psi.... for a whole tank and only got like 25-26, thats bad so i hear... imma try to reset my ecu...
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Old 08-11-2004   #88  
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hmmm i don't drive granny at all i always shift at 4000rpm. dunno what to say. reseting the ECU wouldn't hurt.
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Old 08-14-2004   #89  
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last week the odometer reached 15,000km and the last fill up calculation was 8.3L/100km (half hwy)

that was the best fuel economy i've ever gotten with the 2002 si-g (usa EX)

the car used to always average at 10L/100km
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Old 08-15-2004   #90  
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i drive an 03 auto sedan...im averaging like 8.5L/100km, i rarely get better than that...sometimes even past 10.5L/100km! does anyone know how this problem can be fixed??
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