<FONT COLOR="green">Car: 2000 civic ex sedan MT

Mods: NONE - bone stock

Miles: 69,000

Driven: like a granny, shifting 60% at 2500rpm, 40% at 3,200 rpms

Clutch: stock still grabs okay

Spark Plugs: NGK at autozone... pregapped

Air Filter: OEM replacement

TESTED: full 10.5 to 11 gallons to almost bone dry.... have been doing this test almost every time I fill up

Weather: I'm in MN... weather does not seem to affect it very much at all
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Okay I got this car 1yrs ago(new spark plugs)...right when I got it I always seem to get <FONT COLOR="blue"> 290-315mpg on full tank (hwy/city)</FONT>.... after driving 15K on the same spark plugs; the past 2 months I've been getting <FONT COLOR="red">350-370mpg on full tank.</FONT>

Last week I change spark plugs and they were fairly bad. BLACK & basically worn down to the crown. The motor did have better throttle response but nothing to get excited about...... BUT I instanly saw change in MPG after 1-2days of driving it.


WTF? I bought my civic to get good gas milage....
290-315 MPG on 11gals IMHO is not all that great

Any thoughts?

 

Please see your other post in the civic section.

 

Did you get the gas at the same station? Some manufactures have more Ethanol in there gas and you will get worse mileage with that gas.
Also make sure the plug temperature range is exactly the same. Old vs New.

 

probably your driving style did it, you were testing how well the car moved with the plugs.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Flashmn &raquo;</TD></TR><TR><TD CLASS="quote">probably your driving style did it, you were testing how well the car moved with the plugs.</TD></TR></TABLE>

noo.... not driving style.
when i say it was better throttle response, it's just from noticing it while drivng normally.

 

its sub-conscious, you wont notice it. Its the same as you think you have more power when you have a cone filter.

 

Just as an update...


for the past 3-4 tanks, i've been getting 350-360 so it's all good now.

 

man this was a pointless thread. glad ur getting that good mileage back

 

glad we got this all cleared up, i was starting to think it was time for a major overhaul.