So I have been driving this 1990 Civic CX (Canadian STD)
Put in a full tank... And I am still driving on that same tank 650 kms later... Don't know why I am getting such good mileage!

 

good gas maybe?

 

nope...
give it about 12 hours and your gas guage will plumit down.
when i put gas in my car and i drive around all day it will barely go down, but in the morning when i start it back up my guage will drop down a few pinches.

it does this alot when i have a full tank of gas.
another trick to find out your gas level is to FLOOR IT! i hold it till my vtec comes on then my guage will drop to its correct level.

 

I still have a quarter left... and I have driven 650 kms so far...

 

lol just trust me it'll go down. i drive 3 CRXs and they all do that. give it a day to rest and it should drop down....unless u broke ur meter lol

 

Yeah happend in my CRX. It doesn't move at all for 150 miles but right after that it this drows.

 

thats 4 crx's that do the same thing....AND COUNTING!

 

lazy sending unit? my old cx got amazing gas milage as well 500-700kms a tank with 94 octane(motor had just been rebuilt) bump for d15b2 DPFI!

 

you've gotta remember that the cars are 20 years old too. the sending units aren't the most up to date technology. my level will go up and down depending on which steep hill i'm driving on.

 

Well, the tank finished off at 715 kms. and that was when i decided to put more gas in it. lol.

the civic truly gets legendary gas mileage.

can we make a gas mileage thread? it is tech related, aint it?

so, $45 CAD (full) = 715 kms (mostly highway)

post yours.

 

The shape of the gas tank is not a rectangle. There are humps above where the top of the the level arm cannot go into, so for your first 100 miles or so, your gas guage usually doesn't move, then drops pretty rapidly after that.

 

There are a buttload of gas mileage threads already. What's the point?

Besides, your measurement criteria is flawed. Gas mileage is calculated in miles per gallon, or in your case kilometers per liter. Not how much $$ per tank, etc.

 

ok.... $45 at $.85 per litre.
so... around 50 L
715km/50L = 14.3km/L

convert that to mpg. multiply by around 3? so around 40-43 mpg?

 

Actually 33.6 miles per gallon. Pretty good considering the cool temperatures.

 

Taking an average of several fillups is really key. For one, errors in gas station pumps can throw things off. A 5% error (meaning you are getting as much as 5% more or 5% less than what is shown on the pump dial) is not unusual, though I believe in most states that would be caught by inspectors and corrected pretty quick.