Hello, I have an 07 Civic EX. I've bought it in Calgary where I lived for a while, and used to get great gas mileage, but now that I've moved to Ottawa, the mileage is terrible. Have a look below for comparisons:

Calgary, 90% city / 10% hwy, 3300' altitude: 600 kms on 45 liters
Ottawa, 50% city / 50% hwy, sea level altitude: 500 kms on 45 liters

As you can see, I commute a lot more on the highway in Ottawa, and my mileage is significantly worse (a 17% drop in fuel efficiency). I did drive across the country (3,500kms) for my move, but unless a bird got stuck in my air intake, I don't think it's an airflow issue. Nor that my filter got THAT much dirtier in 3,500kms. The only other difference I've noticed is my car's performance, which feels a lot peppier now due to the lack of high-altitude-related-power-loss, but trust me, the problem also isn't with my right foot. Accelerating hard in a 140hp FF car isn't where I get my thrills!

Sure I can check my tire pressures and air filter and what not, but I highly doubt it will fix my problem. Would resetting my battery help, by allowing the ECU to "re-learn" the air characteristics? Besides unplugging the battery for 10 minutes and plugging it back in, can I not do the same operation by only removing a fuse? And if so, which one?

What else can you recommend?

Thanks in advance!

 

Hmm... 31 views, not a single reply...

 

The battery trick might help a tiny bit.
Altitude does the job and im pretty sure you cant work around it.

it might be the different gas also but not as probable.


If you want i would recommend running some fuel system cleaner

If you have an ex and complaining about gas its


Time to get a hybrid!
hope that helps a little

 

air is most dense at sea level. so ur car mixes in more furl to compensate for the dense air. the ecu thing does work for a lil while. there are other factors, like tire pressure, wind, humidity, temperature, how long u idle without moving, how far u push the gas, the type of gas, etc. i think the ecu has a fuse??? some1 correct me if im wrong

 

You could try getting 89 octane instead of 87...might help a tiny bit. Probably not enough to offset the cost though.

 

wow...you got 372miles on one fill up ?! thats crazy...i havent even gotten close to that.
you are getting about the same as im getting. im basically at sea level.

check your filter and check your maf, it may have gotten dirty


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Demonis &raquo;</TD></TR><TR><TD CLASS="quote">You could try getting 89 octane instead of 87...might help a tiny bit. Probably not enough to offset the cost though.</TD></TR></TABLE>

i've actually tried this...slight improvement but like you said...costs outweigh benefits.


Modified by pd0019 at 11:58 AM 4/30/2008

 

Alot of hills perhaps?

Staten Island (where i live) is flat
however.. if i relocated to colorado in the mountains i'm sure i'd be getting totally different MPG

 

fact is that the higher you are above sea level the less air pressure there is and your car probably runs rich and if u check ur muffler ur tip is black.
solution turbo and tune

 

I lived at 7,000 ft above sea level for the first year I owned my car, moved closer to 1,000 ft about 6 months ago and noticed an increase in gas mileage. Lower elevation = more air.

I average 350/MPT w/ 91 oct.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pd0019 &raquo;</TD></TR><TR><TD CLASS="quote">

i've actually tried this...slight improvement but like you said...costs outweigh benefits.
</TD></TR></TABLE>

Can't afford an extra dollar or two at the pumps eh?


Modified by TRE_ at 1:26 PM 5/2/2008