Thats shitty. I get 250 a tank in my TII while driving it like a sportscar, I do mostly freeway 2/3-3/4 of the time. Mods are listed below. I seem to boost really easy too.

 

when i had my t2, i was running way rich because of my ems not fully tuned, i got 200-220 to the tank, now my 91 base na, i get around 300-330.

 

I get 400+ miles-per-tank from my fc consistently (mater of fact: I can't remember ever getting under 400).

My secret: LS1 5.7L V8. It just so happens that this fuel economy mod comes with 340hp and 300+ ft-lbs of usable torque.

 

Yes, it is. There are a scattered few people reliably getting almost 30mpg on a rotary. However, it involves a fairly well designed/built engine (high compression rotors, good intake/exhaust work), a well tuned engine management system, and IIRC ends up with exhaust gas temperatures at cruise high enough to make short work of any cats you might need.

-=Russ=-

 

387.5 mile per (last) tank

S5 Vert
top down some
highway/city
lots of A/C
Only two, 2 gear, redlines

I think 400 per tank is possible

 

400 miles on a tank!?!?! If I put it on a trailer or tow it maybe. If your getting that kind of mpg then you have a major problem. Start driving you car like its suppose to be driven!!!

Nah, highway miles I could see it with no problem on either of my cars if I rarely/never kicked in the secondaries. It has as much to do with the driver as the car being tuned correctly.

 

i get about 425 on the highway ... city .... thats another story ... the most ive hit city/partial highway is about 225 and I usually get around 175-190 if im lucky

 

Remember S5 models have about two extra gallons in their gas tank, so S5 models should get better MPT (Mileage Per Tankfull) than a S4.

 

The best my S4 NA 5spd got was 26 MPG @ about 70MPH on the 101 between NorCal and SoCal. It usually averaged 23-24 freeway... Now that it's a turbo converstion, the best has been 23-24 on the freeway and about 5 gallons a mile around town

 

Good point Icemark. As long as I don't hammer mine too often, I get about 300-310 on my s5. If I do some extra redlining and high speed schenanigans, it sometimes goes lower than 275.

And for the person who says the calculate milage by filling up, driving 100 miles and filling up again, that is an poor way of calculating your milage. If you only run the numbers on the first few miles of a fillup, your mlage will be much lower as the car it a lot heavier on a full than empty tank.

I always fill mine til pump clicks off once and set the trip. Then, after I've run it until near empty (or even when the ggs light comes on), I fill up again to first pump cutoff and use the number of gallons I just pumped and trip reading to calculate. Granted there may still be some error if the pumps are different and click off at different points, but the margin of error must be much smaller given that all pumps (in NYS atleast) must be verified yearly by the county board of weights and measures and also given the okay by the fire marshall once every five (I think) for safety and pump leakage.

 

I would bet you that its the ECM, and ONLY the ECM. If you have a better intake than stock and a paired exhaust header with no restrictions it would help a ton, but ultimately I really think it comes down to the ecm and the fact that stock it seems to just dump fuel when you dont want it to and then cut it when you want that even less. :P

I might go w/ a Megasquirted FC sometime if I want a small displacement NA motor to play with some day (Ive already decided Im done with front drives) and from what I've seen, guys who go with a standalone get 22-25 mpg rather easily.

Of course, now I wonder... are there any good intakes out there that would accept a regular monoblade TB? Ive seen intakes for weber carbs, and Ive heard of a holley carb intake, Id imagine the holley would be easier to find a bolt-on TB solution for. You'd just probably have to cut and reweld the intake 90* so the opening faces forward instead of 'up' unless holley makes a side draft carb.

But, ultimately, a full featured standalone properly tuned in that goes lean at cruise and part throttle and cuts on decel would prolly gain some power and save you a lot of gas vs the DUMP DUMP LOL kind of tuning these motors seem to have.

If you have a turbo, though, due to the fear of knocking youd probably need an ion sensing ecm, or just a very good knock computer to go lean under vac/low loads without worrying about replacing some popped seals.

 

I always fill mine to the top where i can see gas at the flap in the filler neck

 

S4 N/A, almost stock.
softest driving: 18/26 mpg (typical; record = 21/27 mpg, probably pump error on the 27)
hardest driving: 16/22 mpg (minimum)
pure neighborhood driving, many stops, traffic, 20mph: 9 mpg (minimum)
26mpg = 416mpt (using 16 gallons)
Synthetic oils all around may have added 1mpg.

What's this about some brand of ignition adding 2mpg? I don't even know what that guy is talking about. Is it an ignition control system?

 

damn I stretched it to 230 per tank once(city), almost had a heart attack.

 

just saw 401.1 MPT last night. ~25k miles on an S5 reman block 20-50 dino oil.
17.385gal on fill up.

 

23 MPG for pure highway is pretty normal.

Although I get closer to 16 for purely city mileage (but the traffic is pretty terrible and my trips are short).

 

I saw 80 miles per 3/4 tank last time my car ran, didn't help the WB was fried and I didn't know it, so it was thinking super-lean condition- dump fuel in.

 

this wasn't pure highway...but very normal driving. Not saying my motor is beyond normal, but it can be done.

 

why does every say 80 is at 4150 rpm in a GTUs? I have one and it's at 3500 rpm for me. Still, I get shitty as mileage (17 combined city/highway)

 

i get 9 mpg ...

 

I am not sure but I only do alot of spirited driving with my 86 n/a 5spd base and I prolly get 200 miles if that per tank!

 

I got 450 miles to a tank once.

I have no emmisions, highflow exhaust, cone filter. SAFC (not tuned).

Thats about it.

If I fill my tank I get about 280-340 miles to a tank. If I only fill my tank half way like I have been doing. I get 110 miles or more to a 1/4 tank. There for I get 220+ miles on a half a tank

So about 25+ miles per gallon.

Read what I put up here to get the most MPG
http://howto.globalvicinity.com/gv_w...=164&co=1&vi=1

 

Gas mileage!!??

I got your gas mileage right here, bucko.

I checked my mileage when I first got the car ('91 NA), nearly had a stroke and decided it would best for both me and the car never to check it again.

So far, we're both happy.

 

Well I get barely over 20 mpg on my lightly lightly modified 87 Luxury na
so I guess thats... 20x15= over 300 on a tank.

 

i think im about around half and im right at 100 on my 91 n/a... gross even for todays (fake) standards...but i drive - ah, how do you say - crookedly