rx-8 gas mileage
 

i been searching all over the forum and didnt really find a satisfied answer of the MPG question.

feels like the best mileage people get from their 8 is 21MPG and that is driving like grandma. never rev over 3.5k RPM. and mostly freeway. so i want to know what are the avg gas mileage you folks are getting.

but please include when do you shift, and what is the MPH while you cruise on the freeway. because driving at 60MPH and 80MPH makes a big difference.

80MPH RPM is at 4k and 60MPH is at 3k

For EX my self.

19 MPG avg
shift under 4k
cursing at 70 on freeway.


i did 115 miles on the first half tank

:banghead:

try shifting at 3k & drive no higher than 70......
just a guess!!

i got 336 on time on a tank

i average 240/tank, about 18mpg and regularly shift between 5-6krpms

Don't base your mileage on the gas gauge because it's very non linear.

I've been tracking my mileage for two years now. The two biggest influences on your mileage outside of driving style are ambient temperature and the number of warm-ups per tank. Long highway trips in the summer give the best mileage while multiple short trips in the winter give the worst.
Driving style and elimination of short trips are the easiest improvements.
Use engine braking to take advantage of fuel cut-off. Idle wastes gas. Anticipate lights to keep the car rolling. Accelerate gently but remember to redline it once per trip when it's warmed up.

Best mileage - 10 liters per 100 km.
Worst mileage - 15 liters/100km

:lol:

i get 19, 20 no matter what ,shifting at 4k,6k,10k, pretty cool.

where you live makes a difference too actually -

I have an 2005 AT and drive with a fair amount of sanity (mostly go with the flow of traffic)

I check my mileage every tank and always reset my trip odometer when i get gas

I got 19-21 nearly every tank (except for trips) for 2 years when i lived in Nashville TN

and since i've lived here near LA I get 17-19.. i blame the poor air quality, lower octane fuel (91 instead of 93) and faster interstate speeds and more stop and go traffic

Just found my new siggy

im glad that you liked it and you guys are very easily entertained.

the reason why i asked about the is because there really wasn't any answer to it. if you type MPG, gas mileage, or miles per gallon on any part of the forum it gives you very little thread to read about. and most of them are from few years ago. rx8club is pretty dead compare to other forums that i belong to. when i try to look for anything on the forum, all the answer are on some stone age thread. and when people bring one question back to the date, they get flamed instead of getting the answers they want to know. we all know there is a search button, but do they always give you what exactly you looking for? this is a new forum, and many of the people here are still new, so just answer the question and walk on, i would really appreciated.

thanks to those people we replied to the topic. and hope those people with a lot of post counts enjoyed the thread.


and here is something might be helpful when you filling up the gas, i got it for my subaru forum. most of you might know some part already.

Here are some tricks to help you get your money's worth:

1. Fill up your car or truck in the morning when the temperature
is still cool. Remember that all service stations have their storage
tanks buried below ground; and the colder the ground, the denser
the gasoline. When it gets warmer gasoline expands, so if you're
filling up in the afternoon or in the evening, what should be a gallon
is not exactly a gallon. In the petroleum business, the specific gravity
and temperature of the fuel (gasoline,diesel, jet fuel, ethanol and other
petroleum products) are significant. Every truckload that we load is
temperature-compensated so that the indicated gallon gage is actually
the amount pumped. A one-degree rise in temperature is a big deal for
businesses, but service stations don't have temperature compensation
at their pumps.

2. If a tanker truck is filling the station's tank at the time you want to
buy gas, do not fill up; most likely dirt and sludge in the tank is being
stirred up when gas is being delivered, and you might be transferring
that dirt from the bottom of their tank into your car's t ank.

3. Fill up when your gas tank is half-full (or half-empty), because the
more gas you have in your tank the less air there is and gasoline
evaporates rapidly, especially when it's warm. (Gasoline storage tanks
have an internal floating 'roof'membrane to act as a barrier between
the gas and the atmosphere, thereby minimizing evaporation.)

4. If you look at the trigger you'll see that it has three delivery settings:
slow, medium and high. When you're filling up do not squeeze the trigger
of the nozzle to the high setting. You should be pumping at the slow setting,
thereby minimizing vapors created while you are pumping.
Hoses at the pump are corrugated; the corrugations act as a return path
for vapor recovery from gas that already has been metered. If you are
pumping at the high setting, the agitated gasoline contains more vapor,
which is being sucked back into the underground tank, so you're getting
less gas for your money. Hope this will help ease your 'pain at the pump'

mmmmmm.......gasoline expert?

the truth of the matter is these cars do not get good gas mileage no matter what so why worry. i got 300 miles on a tank all freeway doing about 75 (obviously there was no shifting)
i am currently getting 200 mile to a tank and i drive 50/50 freeway/surface streets. speedlimit on the street is between 35-50 and freeway is 75. i shift at 3500 to 4500 on average but when i feel in the food it is more like 7000 (especiily since i have a new exhaust) i havent seen any change in MPG when i have fun every now and then.

but why dos it matter again? most sports cars do not get good MPG's.

dead what forums have you been to, there is quite a bit of activity here. if the gas thread you speak of are old, that is because it is common knowledge now about the RX8 and MPG, i knew this before i bought the car. why dont you help mazda persue the rotary engine. i would say they have done a darn good job being the only manufacture in the industry doing so.

Honestly - If MPG is that big of a factor - get a new car.

im on my350z and i-club and i don't think i have to explain anymore. i am a active forum member on forums that i like. i have 2000+ post count on the Z forum and 1500ish on i-club. i would think that this forum would be as fun as the others, but i guess not.

and you asked why bother so much? well answer is because i want to see how can i get better mileage. if you going to ask, "O if you want better mileage, get a honda!" i don't need that kind of answers, even hummer forums talk about how to get better gas mileage! i don't see they tell each other to buy a honda?!

where in the thread did i say MPG is a big factor that i can't deal with?

its really funny how, its just a simple thread, and you guys make a such fuss about it?? weird, what do you guys like to talk about anyway? a simple MPG question and discussion will lead to all this crap. car forum shouldn't be like this.

then why start the thread. most threads that get started get out of hand becasue they shouldnt have been started in the first place.

So you are comparing a forum for the RX vs. the Z? Considering the z sells about 3 cars per every RX. . . my guess is their forum is about 3 times bigger. . . .just a guess


And do not take offense to any this, dont let people get to you like that. You must understand that if you searched for "MPG" in TITLES ONLY there are 5 pages of results. And the term "Mileage" returns 6 pages of results.

people get tired of hearing the same old sheet. You are not the first person to be flamed for this, and i fear not the last either.

oh and you have to take in the fact the sheer number of Z's sold compared to 8's and how long imprenza's have been made. this is a smaller market. combine this with the 7 forums and we tripple.

I'm lucky to if I can get 18 MPG.

But, as statted above. I didn't buy an RX-8 for the gas milage.

you guys are right, rx8 is new that is why new people joining all the time.

the only reason why i started this thread is because i want to know the MPG people get combine with their driving style.

i have read from the old posts and found out that its around 21. but how do they get 21MPG? freeway driving? 91 octane? early shifting? its all part of the factors. i just want to know more about it, because i am new to this car and the whole rotary. all i want is to know more about it. every little detail about it. do you guys really have to flame people for doing this?

and i didnt buy rx-8 for mileage also, i got it because i want a good handling car. my wrx has 234whp/253wtq is much faster than the 8, so if i want a fast car i wouldn't buy the 8 right? i like the 8, and the down side to it is the mileage, so i just want to know how can i improve a little. that is all, take it easy guys. just share your answers and tell us how you did it.

"If you want mileage, don't consider yourself a sports car enthusiast. This sort of thing comes with the territory."- mp3guy

Try premixing at 200:1 . A lot of us have seen better mileage with this .....
See the premix stickyed thread

luck of trhe draw man . . luck of the draw.

It seems 2 RX's that came off the assembly line consecutively can differ in mileage by 5mpg.

This leads me to believe that these cars DO have a soul . . . . so I treat mine VERY nice just in case.


all city driving
18.16mpg overall average after 19 months
Now with the wider wheels . . .about 17.??mpg

you havent been flamed this is minor to some of the more harsh guys in here (sad to say) oh and as for my first post i used medium octane (dont tell anyone)

the gas price is going up, i don't know about your area but my area for 91 octane is $3.7 and i am not very balling, i would like to make more off it.

and does it kill you or hurt you if someone just want to know how to get a better mileage out of their gas? gosh

and thanks

HA!!! your cover is blown!!!!

yea, thanks for the answer.

see the tires and mods make a difference too, so is good to know what everyone gets so you have an idea.

i am planning to put 245 all around so i know that is going to take off some miles, but hey like you guys said i didnt get it because the mileage right? but is good to know

no......im not tryin to make anyone feel bad, its just that you know the mileage of the 8, and really there is no way to get better gas mileage, other than not drivin your car.... the way i conserve is just drivin to work and back, if i need to go somewhere close then i skate or bike, excersizing=no gas= best gas mileage...

oh and i have 235/19 (the rims are for sale!, Volk SF Winning)

dasterdly you are

first good plugs wires and coils. second live where it is flat. third check air pressure. fourth get on hi way. cruise at no more that 75 mpg.. last tank like that i got 23.46 mpg..

notes. use 87 oct.

other notes.. the old mpg threads are just as accurate as the car has not changed since 04.

beers :beer:

the thing with that is it's been discussed so many times...again if you just searched in the titles only you would see many relevant threads (as well as ones like these where people just flame -myself included :-P)

But to get the best mileage, it's pretty much the same as for any car.
Don't drive too fast, drive with windows up and no A/C on, highway driving gets the best mileage, etc... none of these are specific to the RX-8...

lol :crying:

Startling new revalation on gas mileage - long trips > short trips !

I get about 240-270 miles per tank with 87 Octane here. 50/50 on highway and city streets with the Street Ecu from RB and 275/18 Enkies all around. I shift between 3-3.5k and cruise the highway between 65-70mph. Hopefully that helps guys.

Wow, no wonder all the threads are old; they get dropped like a hairy spider. I know I'm making a zombie here, but I wanted to 'interject' two theories of mine
1) The more efficient an engine is, the more torque it puts out. Efficiency of an engine varies throughout the rev range, and thus you get a torque curve (it would be more apt to call it an efficiency curve). I have to admit, I've only really driven an 8 once, but I noticed that the torque (and efficiency) didn't really kick very hard until about 4 grand. Cruising rpm is right around 4 grand (70 or so mph), so you're really not running at the best rpm for efficiency or fuel economy.
2) For positive displacement and red line, a 3.3 or so liter v6 engine is the most comparable to an 8. When you're done laughing, read on; a v6 engine has six spark plugs, right? How many does the 8 have? Four. What that means is four spark plugs are doing the work of six. Since a spark plug can only ignite so much fuel/air mixture at a limited rate and in an efficient manner, you get an efficiency deficit. Here's something that compels me: the Mazda 787b that was entered into the 24 hours of lemans endurance race had three spark plugs per rotor. Its fuel economy was terrible indeed (between three and four mpg), but pretty dang good considering the piston'd competition and average speed of 160mph.
These aren't proven, or even very convincing, but I find them quite satisfying to chew on. Yes, other factors are at fault (odd combustion chamber shape, incompletely burning fuel cough*needmoresparkplugs*cough, etc.), but these ones stick out at me. Happy headache!

Uhh everyone here says drive slow and keep the rpm down???
fuck that rev to 4+ before shifting this engine hates low rpm its drowning choking in its own fuel. Theres no toque down low therefor your wasting more gas. keep the rpm above 3 at all times unless your going like 9mph

bump

used to get 20 MPG.

I have no clue how anyone is getting decent MPG, I have been averaging 14-16.5 and on a road trip doing a tank at 80-90 mph I averaged 18.5. I knew that was what I was getting with a rotary, but are other people getting the same?

my 2006 (I have only had her 2 weeks) is averaging 23mpg. on the way home from florida I was sitting around 27-28mpg for all 4 fillups.... I shift at 4500-5500 rpm and cruise at 4000rpm... my ride hime was mostly at 80mph in sixed sitting right on 4000rpm...

I live in east tn... all hills and twistie roads.... The area I live in is approx 1000 feet above sea level....

So according to my car most of the theories are wrong.... OH and I have been running 10% ethanol gas since day 1 simply because I cannot find 100% gas around here or on the way home from tampa... It apprently is not hurting the mpg too much....

I also tend to get up to cruising speed quickly and then sustain speed as much as possible... I leave it in whatever gear I was in while decelerating until I have to either stop (pop straight to neutral) or go again, drop to the proper gear and accel quickly up to cruising. never rolling at idle....

I feel that keeping the engine buzzing high is more efficient than letting it bog down, I am pretty happy with this cars mpg concidering how fun it is. my jeep got around 14mpg so this is a cost savings for me... oh and I am running 91-93 depending on the station. no noticable diff....

I've been getting 13.33 and 13.47 on the last 2 tanks using 93 octane... I don't shift at 8-9k EVERY time, but definitely a good amount with my beautiful exhaust note. I would say on average, I shift at 6k or so.

I got 24 going to Tx from La and back at 70-75mph, went to Ga. above Atlanta and back to La. and got 23-18-22.5 mpg depending on speed.
23mpg at 70-75
18-19 at 80
22.5 at 85-90
All speeds checked by GPS, speedo in car 5-7 mph fast.

If this is the case, so is the Odometer, thus making MPG calculations pretty inaccurate as well...

i get 17 on the streets and 22 on the highway keeping it at 75mph. I shift at 3, and use 87 octane if i know im going to cruise, cause 87 gives you better gas mileage than 91. but if i know im going to be revvin and haulin ass around ill use 91 with some octane booster.

Friendly, Those are 2 of my FAV cars of all time... Beautiful choices! :) I'm totally jealous!

Checked my speedo today with my gps. Mine is spot on.

12 mpg constant.. was lucky to get 13-14 at one point. 4 speed auto. semi lead foot, but i have some engine problems, so im hoping thats why i have crappy mpg