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Old 04-07-2006, 10:27 PM   #1
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Want to improve highway mileage

I tend to put on mostly highway miles, 100-160 miles at a time, and my mileage is still only 40-44mpg at it's very best, I know my 92 civic vx can do better! but I'm running out of ideas of things to check/tune/replace.
recent work:
New front bumper (old one was missing a chunk)
New throttle body.
New o2 sensor.
New 165/70 tires set at 44psi (max rated) front, 35 psi rear.
Synthetic 0w-30 engine oil, 10w30 synthetic motorcycle oil in tranny (had 0w 30 and a bearing was making noise)
a/c removed, grill to be blocked off as soon as the part shows up.
New cap, rotor, wires, ngk zfr5f-11 plugs.
New pcv valve, radiator cap, thermostat.
New larger oil filter to give more filter media/less restricion.
Removed and cleaned fuel injectors.
Replaced exaust and muffler with origonal fit aftermarket parts.
Replaced timing belt and water pump.

I normaly use 92-93 octane 100% gasoline.
I just ordered new oem suspension bushings as my front wheels have just a little play linked to the lower controle arm bushings.
I also ordered oem thermostat, I don't really trust the generic and I haven't been able to find a 192F thermostat, and don't want my fan coming on if it's not needed, and haven't been able to find proof/numbers that hotter is better, just theory so far.
I carry 200+ pounds of work related "stuff" with me alot of the time, but I try to go thru and remove extra unneeded weight when possible.
my compression is 180-185 accrose all cylenders (ideal is 185, 120psi is lowest alowable spec) and the engine seems to run smooth, you wouldn't know it has 220,000 miles on it.
I've thought about a belly pan, and I might make one, but as it is the front bumper's farring extends back nearly to the front axle.

So what can I do? I've been working on pushing this car for better mpg for year that I've owned it now and it's stayed at 40mpg for most of that year, creaping up a little but hardly noticable, it's not even reaching the epa mpg.
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Old 04-07-2006, 11:05 PM   #2
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i think it would benefit

i think it would benefit ever so slightly from a pcv catch can, just to help out with the octane of the air/fuel mixture. also cleaning all that gunk out of the intake manifold from all those miles will help raise the octane of the air/fuel mixture. those two go hand in hand

you already mentioned the belly pan which will definitely help. how is the alignment?

also i noticed two filters werent on your list: air filter and fuel filter, with 220k miles each could hinder the mpg. have they been replaced recently?
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Old 04-07-2006, 11:47 PM   #3
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I'm curious to know why you

I'm curious to know why you are using 92-93 octane. That engine is made for 87, so unless you are living 4000 feet below sea level I don't know why you'd need such high octane gas... unles you enjoy spending money.

I second jared's recommendation to get a new air filter and a new fuel filter. Don't forget to chagne the brass washers when you change that fuel filter. Trust me on that one.

Was it you that had the california VX, or was that someone else? If it's you, you really need to look into converting it to non-CA VX. It will take an extra wire and a new ECU. With that modification alone you'll break 50mpg (lean burn mode). If I'm thinking of someone else, please ignore me

At highway speeds your biggest mpg killers are due to aerodynamics. Work on that belly pan, and start brain-storming about rear wheel skirts. Maybe even getting some flat hubcaps would be a good idea.

Oh yeah, ditch the mudflaps.
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Old 04-08-2006, 01:55 AM   #4
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try to maintain speed by

try to maintain speed by pressing ever as little as possible on the pedal (usually this magic number is 40mph but on the highway try to maintain 50-55mph 60 is pushing it for your small engine)

but drafting works just be very careful. Sometimes it can be hardcore or it can be pretty damn sweet.
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Old 04-08-2006, 04:32 AM   #5
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Ryland, at what speed do you

Ryland, at what speed do you drive?
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Old 04-08-2006, 09:55 AM   #6
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Just wondering, since I am

Just wondering, since I am about to swap injectors, what method did you go about the clean them out?
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Old 04-08-2006, 09:58 AM   #7
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Make sure you scrub your

Make sure you scrub your shizzles real good!
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Old 04-08-2006, 10:05 AM   #8
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Okay, you lost me on that

Okay, you lost me on that one!
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Old 04-08-2006, 10:11 AM   #9
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You know, the shizzie. It's

You know, the shizzie. It's the dealy bob that goes up and down in the injector.
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Old 04-08-2006, 10:12 AM   #10
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Saturday is the day I wake

Saturday is the day I wake up at 1 o'clock because I've only slept 20 hours during the week...help me out here.
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