mpg's:how many are you getting?
 

Did a quick test last night to see how fast the fc was going through gas. Emptied the gas tank completely, poured in roughly half a gallon of 87 octane and let it idle at exactly 1k. It took right around 23 minutes for the engine to die, is that about right for an n/a 13b? I know rotaries aren't notorious for high gas mileage but this seems a little too low. I only let it idle because i dont have insurance on it YET so i cant drive it around :/

Depends on year/model. I'm getting about 13, with a slightly modded S5 TII. I should be getting 16/24 according to theFAQ. 17/25 for a S5 manual, 17/24 for auto and, like I said, 16/24 for turbo.

i average around 270 to a full tank so i get about 16.8 miles to gallon
stock s4 no mods other than a straight pipe

Unless your tank is very clean it is probably not a good thing to rely on the bottom of the barrel to run your car off of as there is often too much gunk and impurities sloshing around the lower depths of the tank which could clog up the fuel sock, fuel filter and so on.

Um, how big is your tank?

I get about 180 to a full tank and that calculates out to ~15mpg.

'88 GTU (S4 N/A)

I believe a stock tank is like 13gal, max. My "full tank" is usually a 12 - 12.5 gallon fill.

I'm getting about 230 0r so on a full tank of gas. And thats with some slight modifications.

s4=16.6 gal
s5=18.8 gal
mine:
auto vert=~19mpg, maybe 17 or 18 with the a/c on.
s4 turbo= ~250rwhp 23 highest tank average. usually 20-21.

I used to get 400 out of my 18.5 gal S5 tank.

My gauge must be off, then.

15.5 on the last tank.

I've never done a scientific test, but 'not good' is my answer.

Nine.

+1

i have a 00 ford explorer that's a family car i fill it up twice a week with about $40+ each time

a 92 Honda accord that's my dd i fill it up once a week with about 25$

and my s5 n/a... well I'll keep my eye on the gauge every time i pass a gas station:lol:

don't expect more then 20mpg. it's not a honda:icon_tup:

i just checked mine this morning.

26 mpg is about what i get.

but bear in mind i am in the perfect setup. i go 1 block then drive north for 22 miles at 55 mph right to work. then back home everyday.

I drive a brand new Focus everyday and i get about 39 mpg in that baby.
But my FC is constantly doing what my avatar shows, and I honestly dont bother recording my mpg because its dreadful. But while highway cruising its not that bad.

S4, To4b Hybrid Turbo @ 10psi 680x1000cc inj, var. res. bypassed walbro.

I've figured about 13mpg city driving with some quick 2nd gear pulls. About 160mi to 12 gallons Still leaning it out... slowly...

In my t2, if I can manage to stay out of boost, I'd do around 16~18 on the street, when I drove the car home from LA to Sacramento, I did around 23~25 mpg cruising

minior mods, modified stock air box (holes cut in it so you can hear the bov more, switching over to a hks intake filter soon), dp 2.5 - 3 inchs, crappy apexi exhaust, fcd and I have a cat with emissions fully intact

but my civic hx blows my fc out the water when it comes to MPG

(0_o)! . yeah this one was rebuilt very well just recently, 13k miles on the new engine. hopefully il be getting something halfway decent like 20-25 when i start daily driving it lol.

maybe 10 on a good cold day

8-9 mpg beating the hell out of it and 28 on the hwy going ~75mph.
If my haltech had sequential injection Im sure I could do better on the hwy.

23min for a half gallon seems a bit much but then again I dont know what stock idle afr is.

i got a 87 tii with rb turbo back front mount and intake and on all highway i get about 26, and around town i get around 19 if i drive economical prolly around 15 with spirited driving

bout 8 spirted
16 hwy cruising @ 70

aggressive streetport/no emmissions/hybrid 60trim/fmic/255 walboro/ 550 720/ rtek 1.7/ rev2/ 3in intake/ heavy and wide 18in wheels

I love boost/love gas stations and love premixing

With my old set up (intake, rev II exhaust, walbro 255) I would get about 14-16 but I do minimal freeway driving so that is on the low side. Now with the new set up I am hoping for better mpg but i am expecting worse, if that makes sense.

i am going to estimate 10MPG. 550/1300 twin turbo/untuned. anyone behind me will faint from the fumes.

I get about 22-24mpg on the highway & on the street maybe 16-17mpg. The motor is rebuilt and it's an s5 N/A and it gets surprisingly well numbers for it being a rotary. That's with cruisin speeds & driving the speed limit

the absolute most ive gotten in my n/a 86' is 20mpg. but that was 1/4 throttle, never above 2800 for the entire tank. got 305 miles out of it. surprised the hell out of me...

normally i get around 240 miles to a tank. give or take the mood

i get around 17-18 city driving semi-spirted and its the same with a/c on
highway like around 23-24 maybe 26 depending on weather

6pi wired open stock motor with 194,xxx
3in exhaust, header,emission removed,and e fans stock airbox with a drop-in k&n rest of mods look at sig

S5 Vert, 4k miles on motor. ported exhaust ports, stock intake ports.

Roughly 13mpg if not less on the street and up to 22mpg on the highway if I sit at 80mph. I get better at 80mph than I do at 60.

^ Same with my dads E46 M3. He averaged 85mph on the way to vegas and got 34mpg on that tank. Thats why BMW is BMW, they know how to get things right.

8 mpg at the moment shifting at 3k. Trying to figure out what the problem is.

15 mpg
88 s4 na with i/h/e

Rotaries kills earth but its fun to drive =]

I throw 20 bucks worth into my tank. At the price right now i get 7.1xx gallons. Usually get a little only 100 miles then need to throw 20 bucks worth in it again. Averages out to an estimate of 14+ MPG. That sucks but i do city driving 99% of the time with a mostly light foot. If it were all highway and i stayed under 70mph my mpg would be great. Car is fully tuned up and a healthy engine sooo i dont know how you people can get great mpg.

20 Average spirited driving on an S5 NA Streetport

What a bunch of gas hogs... I usually get 25 or 26 MPG mixed driving (modified 88 N/A).

well i can't fill up my car cause the tank has a leak somewhere going to address that very soon. but this week driving fast i actually got pretty good mileage prolly like 10 / gal but its normally about 9 need to do a rebuild

I'd love to know the secret of the guys who can get 26 mpg or higher on the highway out of an NA rotary. I've put about 140,000 miles on my two NAs over the years, and I think I just set a personal best of 24 mpg this past weekend. It helps when you don't encounter much traffic because there isn't so much acceleration/deceleration going on.

Around town, I used to get 14-15 mpg out of my street ported S5 NA and I get the same now out of my lower-mileage S4 NA.

havent been keeping track lately but the current STOCK s4 gxl gets 18ish in town and 22-23 on the road.

i think the turbo cars have more potential for mileage, as they run in closed loop in vacuum, the NA's don't.

I'm currently breaking in my new engine. I am running the motor NA at the moment. My air filter is just stuck on the TB elbow for now, and the turbo is just free-wheeling. The intercooler isn't even in the car currently. My car is running a little rich, and idle is at 1500 rpm. I haven't gone over 3600 rpm. The results?

A whopping 9.55 mpg, driven as nice as this car is ever going to be driven. True I run E85, but damn.....

i never rev - and just cruise control all the way to work.

I'll bet where you live has something to do with it too. Most of my highway driving is between D.C. and Pittsburgh which involves some pretty substantial elevation changes. If you're in a level place, that probably helps. I also tend to avoid the cruise control because it seems to take some of the fun away from driving. (My current RX-7 is a second car and not used for ordinary commuting.)

actually i live in the mountains of Idaho. google "sun valley Idaho"

im at 7000 feet or so and my elevation changes by about 500 feet. maybe 800. but it's straight as an arrow from my house to work (20-ish miles @ 55 mph) with just about no traffic.

OP: Covered in FAQ. 17/25 is normal if nothing's broken.

I've gotten 26 on 2 different RX-7s just by driving at 60-70mph. But at faster speeds it's typically 22-23 freeway.

Minor factors: O2 sensor + constant throttle on freeway, basic maintenance
Major factors: broken fuel delivery / sensors / etc., poor compression, etc., speed (but acceleration doesn't matter), excessive braking (e.g., from tailing someone too close). Driving below 30mph really kills mpg too.

The two major ways to boost mpg beyond stock are tuning lean, but you increase risk of detonation if you go too far, and a taller final drive ratio such as the one from a convertible, but this reduces acceleration. Each is good for 2-3 mpg IIRC.

^^

Good call on the final drive - love my vert

My S5 T2 averages 17-19 with full exhaust, an rtek 1.7 and 750cc secondaries. It's mostly freeway driving, and I usually behave and stay off the turbo. With AC is averages 16-18.

thats incredible.

I get like 170-180 on a full tank of gas (i've never run it until stalling though)

pretty stock s4. I need to know how to get such high mpg O_o I don't run the a/c ever and highest i get before shifting is 4k when i'm feeling a little dangerous.

I think it's the fuel injectors needing service (stuck, leaking, etc). I'm going to send mine off within these next couple of weeks and see how I do on the mpg department. Wish I could hit 15mpg minumum.

i got 22.5mpg with the stage 2 hybrid turbo on the highway and around 15 in town. now with the t70 turbo and 300WHP+ i get right around 20 on the highway and about 13 in town, haven't done fine tuning with the big turbo yet so i know it can be improved.

the microtech and tuning time is what makes mpg.

I get a solid 21 with the cruise set at 70. Car has a jspec TII engine with a walbro 255, FCD, RB 3in Dp, Borla Cat back, and a custom tid.

I almost always average out right around 20. Moderately modified S4 n/a.