Ultimate fuel economy thread! How efficient is YOUR S-chassis or Z? How'd you do it?

[di-devol]

MPG 29.9 highway
Stock rebuilt SR with 9k on it
Open BOV
Welded diff
180sx wheels
1pc driveshaft
cheapest tires I can get, normal air pressure.

I haven't calculated city mpg

[illvialuver]

Whoever said the thing about the gas mileage sucking after 62 mph is right. I drove from Costa Mesa Ca to fresno Ca this weekend, and filled up with 89 octane and 36 psi in the tires and only used 1/3 of a tank going there, then I filled up again on the way back and got the same milege, I am sure it would have been a little better if the cruisecontrol worked. that is roughly 265 miles on bout 5 gallons of gas. Super good gas mileage.

[unreal-]

96 S14
---------
I/H/E (leaking between 4th runner and EGR)
S13 Cams
25* timing
VLSD
bad alignment

If i dont drive like an asshole, i usually can get 260-270/tank and when i fill up i take between 10.5/11.5 gallons. And thats with the tank almost on E. Since theres no warning light, i usually fill up when the needle starts getting near E. Im sure if i ran it to fumes i could get 300mi/tank.

Once i get a proper alignment, fix the leak, and get a tuned ECU im sure my MPG will improve.

[FaLKoN240]

Just get an alignment, you're basically throwing money out the window (wasting money and time) if you don't have your car aligned.

Originally Posted by unreal-

96 S14
---------
I/H/E (leaking between 4th runner and EGR)
S13 Cams
25* timing
VLSD
bad alignment

If i dont drive like an asshole, i usually can get 260-270/tank and when i fill up i take between 10.5/11.5 gallons. And thats with the tank almost on E. Since theres no warning light, i usually fill up when the needle starts getting near E. Im sure if i ran it to fumes i could get 300mi/tank.

Once i get a proper alignment, fix the leak, and get a tuned ECU im sure my MPG will improve.

[unreal-]

Originally Posted by FaLKoN240

Just get an alignment, you're basically throwing money out the window (wasting money and time) if you don't have your car aligned.

Yea, i realize that. Waiting to get my rear 5lug, ES FLCA bushings, and my ERS springs installed on my Fortune coilovers then i'll get an alignment.

[new2240s]

I have a freshly rebuilt ka24de (300 miles) with forged internals JE 9.1 comp, 248/248 cams, z32 MAF, AFC NEO.

Right now I am doing almost 100% city driving in Seattle and am getting 17.2 mpg, I am thinking that isn't too bad especially since I am letting it idle 2-5 min before driving it.

[2forty]

Originally Posted by illvialuver

Whoever said the thing about the gas mileage sucking after 62 mph is right. I drove from Costa Mesa Ca to fresno Ca this weekend, and filled up with 89 octane and 36 psi in the tires and only used 1/3 of a tank going there, then I filled up again on the way back and got the same milege, I am sure it would have been a little better if the cruisecontrol worked. that is roughly 265 miles on bout 5 gallons of gas. Super good gas mileage.

rob are you saying you got over 50mpg? lol. you arent driving a prius. haha

[zurud]

I got 20 mpg city with my sr20det 240sx. I am not really happy about it especially with 93 octane gas. Do you guys think 240sx with lsx t56 and 2.73 rear end will get 30mpg city?

[bb4_96]

^ definitely

[IHasLongTorso]

Originally Posted by 2forty

rob are you saying you got over 50mpg? lol. you arent driving a prius. haha

It would actually be just under 50 by his math but he needs to do it again top off the tank and then again when he gets there to know exactly how much fuel he used. His math is based off 250miles using roughly 5 gallons. But if he used 6 or 7 it would be between 35 and 42 miles to the gallon which id say is believable. More believable than a member on here claiming 50some odd mpg with a single cam with a 255lph fuel pump. Lol no.

[TwelveAM]

I've noticed that mine gets about 20mpg since it's not tuned yet..

740cc injectors are killing me, makes me want to invest in a hybrid for a daily commuter.

[2forty]

Originally Posted by IHasLongTorso

It would actually be just under 50 by his math but he needs to do it again top off the tank and then again when he gets there to know exactly how much fuel he used. His math is based off 250miles using roughly 5 gallons. But if he used 6 or 7 it would be between 35 and 42 miles to the gallon which id say is believable. More believable than a member on here claiming 50some odd mpg with a single cam with a 255lph fuel pump. Lol no.

i quoted 265 on 5 gallons. thats more than 50. 53mpg. i call fakies haha. if he can drive 680 miles on a tank ill shut up. thanks andrew. and i saw your goofy ass face in the mag haha.

[kevin_s13.5]

S14
Rb25
j30 vlsd
aluminum driveshaft
stock injectors
255 pump
tomei fpr
greddy open bov
Ebay gt28

I got 26 mpg on mostly freeway.

[JKL1031]

dont care becah race cah.

[Mountain_Man]

my rb20 s13 hwy got 25 mpg.

93 octane
no air filter
no intercooler
no radiator fans
welded stock diff
stripped interior
r33 gtr wheels in the front
300z wheels in the back
SLAMMED
low compression

i thought that was good.

[8Nismo9]

Would you say the sr20 gets better fuel mileage than a ka24?especially if you stay in vaccum

[silva.240]

my 92 ka24de with suspension and no power add-ons . i have recorded 22.3 mpg on long highway drives. that is with an average speed of about 75 mph . with a couple pushes towards 90-95. i'm sure i can bring up the mpg to about 24 if i drove like grandma, but city driving is under 20 mpg.

[didderson]

Originally Posted by 8Nismo9

Would you say the sr20 gets better fuel mileage than a ka24?especially if you stay in vaccum

Definitely.

If you are light on the throttle on both engines, the SR20 has less displacement, and a lower compression ratio than a KA at full vacuum, so in theory a KA will always need more fuel to cover the increased compression volume.

Small engine turbo is great. 30+mpg and 2xx horsepower whenever you want it

[Purestock240]

single cam with intake/ header and exhaust

18 mpg if im driving up and down hills and stiuff/ stop and go

27mpg if i baby it and don't change elevation at all

[8Nismo9]

I could see a 510 with a stock SR20.and any lightweight parts and CF parts would be great on gas mileage

[EvilEgg13]

my 93 ka24de got 32.5 averaging about 70 over a 200 some mile trip

Stock engine, minus megan cat-back exhaust with rattling baffles and aftermarket filter.



Definitely need to test this under 62 mph mpg boost.

[Shift n Drift]

time of day matters too guys, remember fuel expands when its hot outside, I drove my accord to ohio from florida last week, left at 1am got 435 to tank, filled back up at 8am and got 460.

[g00se]

So I've been tracking my fuel mileage since this thread started on Fuelly and I still have not been able to break 24 mpg (completely stock 1998 ka24 but on heavy 18" 350z anniversary wheels)

I am always up to date with maint and the car is running fine. Does the efficiency of having i/h/e add another 6 mpg?

[djaztek12]

i only get 17 mpg mostly freeway driving on a 1995 s14. 205 miles per full tank.12 gallon tank wtf. is something wrong.lol any tips from the experts.

mods.
stock ka24de internals
cams
cams gears
headers
intake
cat back exhaust
18" racing hart wheels

[rb25crazy]

damn, I get roughly 20-25 mpg in city seems pretty weak imo. I have short commutes like 3-4 miles. Sometimes it feels as if I am only getting 15 mpg...

Stock ka24de
injen intake
5zigen border 3 exhaust
coilovers

that's about it... car is not pulling any cel or anything.

To the guy who mentioned that the car can get tuned out in the rom... how or where to do that? i drive 75+sometimes on the freeway would like to make it no rich if possible.

also, what happen to the gear ratio calculator file it's a dead link =(

Thanks!

[KiLLeR2001]

Originally Posted by KiLLeR2001

I get about 21 city and 24 highway with my redtop SR. VLSD, new subframe bushings, gas tank cleansing coming up soon, so I'll be sure to record any differences. I also need about 2 inches moar low.

Drove to Atlanta and back not too long ago, recorded 30.1 mpg on the SR. Overall I'm satisfied.

[Levan. B]

I drive mostly city every day in my bone stock Dual cam car, gets around 28 MPG.
No idea what highway would be.
When I went from 18" Battles to S14 SE's I gained 5 MPG.

[shiftdrift]

in my 97 s14 with 208k miles i'm getting 27mpg average. about 350-360 miles out of 13-14 gallons. hilly driving and some highway.

[jesse_s13]

95 ka 150k

exhaust and intake
17"oz light weight wheels & tires at 35psi

Texas to California.
Loaded with a about 300lbs worth of stuff.

About 70mph
444.8 miles per tank or 32 mpg. On 87 octane.

Mileage improved once I put more miles on the car.

[laurentj23]

26-27 mpg hwy.
3" catback exhaust
Tenzo r short ram intake
New fuel filter
New plugs
New plug wires
Cleaned injectors
Burned oil?!!
Auto driving arnd 75 mph

Cel on due to egr..