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employment whiplash, NC
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3,646 Posts
Discussion Starter #1
What kind of mileage do you guys get? I think I'm getting lousy mileage at ~27 mpg on the highway. Here's what's new on my engine in the past year:
O2 sensor
Distributor cap/rotor button
NGK plugs
NGK wires
JWT intake
Hotshot headers
Pacesetter cat-back
timing at 17 degrees

I've also:
regrounded MAF
cleaned throttle body
cleaned BPT, or whatever it is
checked/adjusted TPS

I'm at a loss. I get ****-E milage around town, too. Maybe I'm driving too fast?



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Matt
92 SE-R from Heck
 

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pwnd
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On the highway mine isnt that bad. Usualy somewhere around 30. I am one of the few that actualy drive the speedlimit so mine may not be too good to compare to. And my automatic, cruises at ~72mph at ~2900rpm's. I try to keep it below 3000 while on the highway cause Im shooting to make the tank last as long as possible. Sometimes I will get over 300 miles to a tank sometimes not. Around town my his utter ****. I sometimes wonder if I get over 20mph in town. You dont seem to be too far down on the mileage...what kinda rims you running? I noticed with Eric's 16"s I got hella better gas mileage. But I would possibly get rid of those NGK plugwires for some stock ones. That may net a couple MPG. But 27 isnt too bad I dont know many that get much higher.
 

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I got around 38 mpg on one stretch on the way back from Meridian. Usually it's in the 32-34 range.

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'93 Sentra SE-R, daily driver and track/autox toy
 

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In the winter I get 24/30 (city/highway) and in the summer I get 27/36. I can get over 400 miles to a tank in the warm weather- my '94 has 173,000 miles and a K&N filter as it's only engine mod.
 

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employment whiplash, NC
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3,646 Posts
Discussion Starter #5
Pat: You must have been drafting a large moving object to get 38mpg


Bowlcut: I have 15X7 Mim Pescaras with 195/50/15 Yoko AVSi.

The only thing I can think of is at 70mph, I'm turning 3500rpms, and nothing I can do is gonna significantly increase mileage.

I need a 6 speed.....

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Matt
92 SE-R from Heck
 

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pwnd
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Well Ive gotten times when i was in the mid to high 30's which kinda makes me think the speedo is off then on again. Cause this last tank i got 300 miles to 3/4 of a tank (8 gallons on fill up) which is 37.5 miles to the gallon. Which I dont know if thats right or not. Need to pull out the map and see what Elizabethon to Nashville is exactly. People keep saying you cant get that with a se-r so I dont know. As for picking up your mileage on the highway, just use cruise, dont go insainly fast stay around 70(which is a bit better for me with the auto tho), dont do any darting around be smooth, dont get impatient just let curise do its job.
 

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there is a chance too that your fuel relay in your tank could be going bad. It is a problem with our cars, and there is a write up on it on SER.net. Check it out.

jason
 

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pwnd
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I never go by my fuel guage. I go by how many miles and how much gas i can squeeze in the tank. I just said 3/4's cause it was down to 1/4, which really means nothing because as usual with classics its way off. At the pump I put in right around 8 gallons, dont feel like pulling out my recept right now. But the trip meter was right around 300, maybe a hair shy. I reset it with each fill up to judge an mpg per tank. A few times Ive noticed above 30 mpg's according to the trip/pump.
 

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pwnd
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The tank is 13.2 Even tho I have never seen the bottom of it. Gas light comes on(which in reality means nothing to a classic) Ive driven around quite a bit more, then fill up, squeeze maybe 10 to 11 gallons. Think the most I ever got in it was 12 gallons. Been too scared to see how far I can go...
 
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I got really brave a few weeks ago, and decided to run my tank down till I was basically running on fumes. I managed to fill up with 12.5 gallons(!), and I think I ended up with soemthing like 30MPG on the highway, which I think is pretty good, considering the Mass pike is mostly hills, and you're constantly slowing down or speeding up depending on Traffic in the a.m.
 
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My mileage sucks as well.

City driving I get from 23-25 MPG right now...
I don't do much highway driving.

Maybe it will go up once it is warmer outside...who knows.. ?
 
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I get around about 32mpg, which is a mixture of city and highway driving, and mainly short journeys (10 miles or less). I normally get around about 400 miles to a full tank of fuel (60 litres/13 gallons).
 

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With most driving around Boston, I get around 25 mpg. I've gotten as good as 34 on the highway, I think, last fall. I'm not sure what your problem could be. I know increasing your timing will decrease mpg some. What kind of fuel do you use? Also, what is your driving style? If you drive like my friend Mark, who is constantly at WOT, and driving 80 to 90 mph on the highway, mpg will suffer a good amount.

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Kevin
93 Classic
Bone Stock
 

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pwnd
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Well the timing actualy helped mine. Well timing it up to 15 instead of like 10 where it was at for some reason. And seems like when ever i stick in 92 (which is rarely) i do get a little better but havent in so long dont know. I use 89 and it does well. Considering that I dont have the timing bumped up high.

LOL thats my old sig you cant use that sig.....


Kevin
93 classic (Automatic, Stuff)
used to be bone stock not much more now


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Thats my opinion and I could be wrong

93 classic
Aztec Red, Automatic, POP, STB, OEC battery tie down, AD22VF's, Pirelli P4000's

 

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employment whiplash, NC
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3,646 Posts
Discussion Starter #16
OK, so can anyone see from my list anything I missed or need to check/replace?

Fuel relay: I refuese to believe this is causing low mileage. Incorrect level readings, sure. But how does it waste gas? I fill up, reset the tripometer, drive, fill up again, calculate mileage. Simple. I know the guage is screwy. When I'm on "E" I can only fit 10 gallons in.

Cruise: I use cruise control religiously on the highway, even for short 10 mile trips. I generally set it to ~72mph (3500 rpm) and leave it.

Hills/Mountains: I live in central NC. We don't have mountains here and the hills are barely considered hills. Not an issue.

Fluids: I use the finest synthetic lubricants from Mobil 1 and Redline in the engine and transmission. No isses there.

I just can't figure out what's left to do. I guess I need to start driving behind semis to catch a draft....



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Matt
92 SE-R from Heck
 

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<font face="Verdana, Arial" size="2">Originally posted by MaddMatt:
OK, so can anyone see from my list anything I missed or need to check/replace?
</font>
Fuel filter? PCV valve?
 

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employment whiplash, NC
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3,646 Posts
Discussion Starter #18
If you think that'll get me from the upper 20s to at least low 30s on the highway, I'll do it this weekend.

Did I mention my car has 70,000 miles? It led an EASY life before I bought it. So easy in fact, I wonder if the throttle body is really dirty from the previous owner. Might need to be removed and soaked. I did not do that. Is there any good info on how to remove the throttle body? It looks terribly difficult.

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Matt
92 SE-R from Heck

[This message has been edited by MaddMatt (edited 03-27-2001).]
 
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Just try to wipe out as much of the "gunk" from the TB as you possibly can!! I didn't, and I had to get a new O2 sensor when I crapped it up with the TB "gunk" after it burned through the engine after spraying out the TB.
 

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pwnd
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What I did was block down the peddal and sprayed A LITTLE carb cleaner on the TB, but then soaked down a couple paper towels. Then just scrubed it that way as best as i could. But it wasnt that dirty. I swear I think its the low ports that have more of a problem with it, or later years with more emmisions stuff. Mine wasnt that dirty, not gunky like most people say they get. I havent cleaned it in a year, and its not that bad still yet, need to check it soon just for the heck of it.
 
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