so far mine is around 20 with combines city/highway.

i learned that if i stay off the second injectors unless i need them my mileage stays above 15

 

The highest avg I've got is about 12mpg.

 

12MPG?? holy ****! My stock 87 GXL got around 22-23 mostly highway but some city! I see your car is no stock GXL tho...

 

12mpg too, after the turbo conversion. but there was some major problems going on.

 

BGH did you own your 87 TII (in your sig) when it was stock? If so how how many MPG did u get? Just wondering cause im buying a TII soon, most likely S4. Thanks man!

 

109.2

Oh wait, wrong car...

 

2.5 MPG, 5000+ rpm for 5 hours, full boost out of every corner

 

27.5mpg
Straight freeway driving
1987 Turbo II, slightly modded


-Ted

 

I got 26 mpg once on 300 miles of straight interstate highway.

 

15.8 mpg highway
11.5 city

 

26mpg on the highway, 87 octane, no boosting. Pretty modded Turbo II.

 

On the same note, what might be some reasons that people are getting shitty gas mileage? Can some rotatry expert explain how we can improve it? My car is also at mid teens all the time and I just drive it as a commuter. Any help could be very useful.

 

no,when I did the conversion, I put in a full exhaust and intake. but I doubt that would really effect the gas mileage too much anyway. I think the real problem, for one, was that I was using the NA AFM(changed it right before I removed the engine again, and it made a big difference), and also, my PD was leaking. plus, I was having some other electrical issues at the time.

hopefully when I get my car up and running again, I should be getting much better MPG.

 

On the highway with a spare on for half the tank I got 20MPG.

Cheers you only got 2.5MPG that day? I think I got ~5MPG.

 

I've gotten about 25MPG once. All freeway driving going about 80+ MPH.

 

The key to getting the super high mileage during freeway driving is to keep the revs the highest without crossing into the secondary fuel injectors.  An AFR gauge will help, as you can tell when the ECU is in closed-loop mode (flickering AFR's) and off the sedondaries.  Typically, this is right under 4kRPM.

Bad gas mileage can be faulted to many things.
Bad O2 sensor
Bad spark plugs
Bad spark plugs wires
Bad grounds
Dirty fuel injectors

Oh, BTW, I do run a Crane Cams HI-6 CDI box.


-Ted

 

I'm getting about 21 MPG on an 88TII...many mods...no emissions... always tuned... and a CraneHi6.
I don't give a f*ck if anyone says it doesn't help because my mpg went from 17-18 to 21. With gas prices hovering at $2.19, it helps.

 

she's in process of some fixes right now, but I got 21-22 mpg driving her home about 700 miles at about 65-70 mph after buying her with NO GROUND!

when we replaced her battery we descovered an empty bolt on the firewall where the ground should have been. She's got a nice 8ga ground now...

 

My record was 14 MPG
my average is about 10.5 MPG

Alota city driving some highway

86 GXL w/ intake + straight pipe
Yes my mileage is horrible...

 

about 25.5 mpg on an all freeway drive. average is about 17-18 when im mostly city.

 

record low: 18 liters in 12KM. that's like what, 2MPG?

damn autocross!



record high: 38.4mpg (in the b2200, towing the 10AE)

 

Hey I got a n00b question kind of, but eventually I wanna get a Haltech E6K/E6X, but lets say I buy that CC HI-6 ignition, would the HI-6 be useless with the Haltech? I have heard many good things about the HI-6 how it improves gas mileage and makes the car feel more responsive or something, but hell for $200 or less it will help out in gas savings! So if I buy the Haltech would the HI-6 be useless (like does the haltech take the place of the crane cams igniton)? Thanks guys!

 

does my clogged charcoal canister have anything to do with the low mileage? my gas tank hums from the pressure.

 

Nooooooo! Never do this! If you do not use the secondary injectors on a regular basis, they will cake up with deposits and the engine will go lean and destroy itself if you try to accelerate at higher rpms.

The worst blown engine that I have ever seen was destroyed by a guy who thought he was being "nice" to the engine by staying out of the secondaries. It was so bad that one apex seal jammed into the groove of another, and a part of an apex seal was impailed in the rotor. Both rotors and the housings were toast, btw.

 

^ Ouch.

On Pump 87 Octane gas:
High: 26MPG 80MPH Highway - Stock in-tune 1990 'vert.
Low: 16MPG w/ VERY Spirited driving mixed w/ nice driving. + RB Exhaust. (And possably an ailing O2 Sensor)