Since I got this civic, 90 Ex MT D16A6, gas milage in town has been good but on the highway has been unsatisfactory. In town I get almost 32mpg while on the highway I only get 34mpg.

Since I got the car in June, I have installed/changed the following:

10W-30 Valvoline with puralator filter
NGK V-Power plugs
Purolator airfilter
Bosch O2 sensor
replaced the stock alternator


Is there anything else that I should be looking at? I have plans to change the plug wires and PCV valve. Any other suggestions?

 

Sounds about right to me. Are you use to seeing more than that?

 

Sea-foam, clean your injectors, check your fuel filter. Is it burning oil? 32/34 is really good. what were you used to?

 

32-34mpg isnt enough for you?
Thats pretty good mpg.
I get 30mpg on my 97' LS, and Im plenty happy with that.
good luck

 

well for one, she isnt burning any oil. I figured that I should be getting more then that on the highway. Close to 40. My girls car, 94 DX, gets over 36mpg at 80mph with the ac on. I was thinking that I should be getting somewhere around that.

I have ran some sea foam through the gas and the fuel filter is stock. I will change that next if I have to. Would an old filter really make a difference on milage?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mwieczorek43 &raquo;</TD></TR><TR><TD CLASS="quote">32-34mpg isnt enough for you?
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Seriously!!!! I get about 30mpg on hwy with mine.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Foxcow &raquo;</TD></TR><TR><TD CLASS="quote">Would an old filter really make a difference on milage?</TD></TR></TABLE>

Probably not.

What motor came in the 90 EX? That could be why your milage is less than her DX. You could check your valve gapping, timing, and compression to make sure your motor's in spec. More than likely you're seeing avg gas milage for that vehicle

 

If your filter is dirty it may be restricting flow. If it is letting pollutants into the fuel line, it could be lowering the octane rating of the fuel being burned. Thus lowering your gas mileage. It probably would not be a noticeable change. Have you tried higher octane gas? Sometimes the difference in price is out weighed by the extra mileage though. I think your GF's DX is a freak...LOL

 

Dude, 32/34 is great. Its not a toyota eco... I get aboutr 35mpg on the highway. Clean your Throttle body, injectors...replace the fuel filter, im sure you will see a few more miles with a new one, how many miles are on the car? I bet it is automatic, right? Get new spark plugs....just wondering, why would get buy new spark plug wires....without new plugs. ??? get new plugs....gap them according to OEM specs.....good luck

 

Sea Foam!!! Helllzzz yeaahhh. It's not just for two strokes anymore.

But what kinda mileage you expecting? I average 30 to 31 mpg combined on my D16Z6.

A DX does have a smaller engine (D15B7??? I dunno, it's a 1.5) and I think the 5th gen has a lower CD than the 4th gen that could contribute to a 2mpg difference.

 

tire pressure? stock rims? stuff like that adds up

 

Its a D16A6
Manual tranny
Bone stock everything
14 inch factory wheels.


I ran some sea foam from the gas tank and I cant say that Ive noticed any difference

 

your gas mileage is great my si only gets about 25-27 maybe. just do a tune up and clean and check all of your ignition, fuel and intake components.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Foxcow &raquo;</TD></TR><TR><TD CLASS="quote">well for one, she isnt burning any oil. I figured that I should be getting more then that on the highway. Close to 40. My girls car, 94 DX, gets over 36mpg at 80mph with the ac on. I was thinking that I should be getting somewhere around that.

I have ran some sea foam through the gas and the fuel filter is stock. I will change that next if I have to. Would an old filter really make a difference on milage?</TD></TR></TABLE>

DX= longer gearing, lower idle and...economic lover! she sould get more mpg than ur a6.

 

34 mpg on 87 oct. stop your bitchin i get 23mpg on my teg with 93oct.

 

In my 95 Dx coupe, I get 36 mpg, highway, with a slight mix of stop/go traffic. No a/c. On the lowest grade pump gas. Manual Trans.

 

what else do you want on an ex sedan
be grateful
my 89 dx hatch only got 35

 

got 35 with gsr.

 

Like I said before, I figured it would be higher. My car is bone stock also... I accept the fact that it is as good as its going to get in its current state.

 

I would say fuel filter and PCV

 

stay out of vtec, lol, jus playin...damn when i had my 86 mr2, i would only get 25 mpg! and that was on a fresh rebuild 1.6 dohc, i dont know whut your whining about...