mazda rx8 mpg
 

I have a 2005 rx8 with 39900 km and I only get 180 km per tank city driving.

Would a engine misfire cause the low gas mileage Im getting.

Let me know thanks

That's pretty harsh.

Do you feel any loss of power, difficulty starting or hesitation? If so then definitely check the plugs & coils.

Check your intake as well, it may be clogged.

What kind of fuel are you using? Any mods?

yes.. it would. Either a dead spark or coil could cause this.

This happened to me not to long ago.. and I was getting about the same consumption as you were.

The car was running smoothly for the most part until it started drowning itself with fuel in the cold and started spazing out.

I only use 91 octane fuel. I dont feel any loss of power but I do notice it takes about 3 seconds when i turn the key to start the car but it may be the cold causing this. as for the spark plugs and coils is it hard to replace myself? How many km per tank do you guys get just curious

Thanks let me know

Plugs are easy: https://www.rx8club.com/showthread.php?t=31872.html

I get about 420-450KM average. Most I ever got was 500 (CC@ 100 straight through the tank). Worse I ever got was about 320 (screwing around and driving it hard).

plugs are easy like what the link showed; but i dunno how hard could that be if replacing all plugs and coils and wires. but i went to ask dealer how much they would cost, the labour is around 60 bux for either coils or plugs. so 120 total basically. therefore, i am assuming it wouldnt be too hard

Im going to replace the spark plugs for now to see if my MPG increases any ideas which spark plugs to order

Try replacing your air filter, as that might be your issue

Then do plugs, coils, wires etc

Well considering you take off one side of the wires to do the plugs... job is 50% done.

Follow the wire about a foot and you're at the coils.

Really can't get any easier :)

Just ordered a K&N filter see how that goes

OEM plugs are the best.

Unless your filter is extremely cruddy that won't help much for mpg :)

just an update on the situation well I ordered sparkplugs and when i went to replace my plugs. Guess what I noticed one of the wires was off the spark plug this must have been the reason for such bad mileage and loss of power I was only running on three plugs.

Any ways I replaced the plugs and reconnected the wires and now the car is flying what a difference in power. I dont know about the mileage yet because havent filled the tank yet since replacing the plugs today. Hopefully mileage will improve dramatically.

That's so high! I only get 300-320KMs on average and that's when I'm already doing 40% highway and not driving hard. Would the type of fuel cause the difference in mpg?

I use Sunoco's 94 Octane right now, I find that the engine runs smoother with 94 than 91, especially at low RPMs going at low speeds.

450!!!! wow i wish i got that, and i drive about 75% highway.... but its rush hour driving...

I've only done a few tanks, but I've gotten around 350kms from ~52-54L of almost exclusively city driving which is 14.9-15.4L/100kms.

I can easily break through 400km when I do 50/50 driving.
Last time I did 410km on 49litres... and after the light I can do around 40-50km's.

23MPG 50/50 city/highway driving FTW!

Wheel alignment makes a big difference on fuel economy.

I had 17.5 MPG for five months (The months I was recording)

Then I chambered my rear wheels.

Now I get 15.3 MPG on average.

Wheel alignment is big difference. (I also hear tire pressure adds to this equation)

I run Esso 91 + 400:1 premix.

Mileage has been a bit worse this year, probably because I am driving mostly city and pretty hard (hitting 320-360 lately).

One of my plug wires came off as well somehow over the winter. I could hear a weird noise. Sounded like it was something clicking under the car, I decided i'd check the engine bay and there I could see the plug-wire arcing with the plug. Easy fix :)

My gas mileage is erratic. I was getting mid 300's when I bought it, low 200's last fall and high 200's this spring...

This here particular tank i'm unsure if i'll even see 200kms lol... :lol: A lot of it has to do with what RPM you tend to run your car at. This last tank i've been running it a little higher due to some raspy-ness at certain RPM's after installing a mid-pipe. I'll be installing a resonator soon to help with that issue.

around 350km for me in city driving. I hate city driving. Now my v6 mazda6 wagon is amazing. It will hit 550km in a full tank on the same type of driving! It's also auto.

350 to 380 KM no matter how, where, or at what speed. Tried slowing down>>same Drive Hard >>same, so I drive how I feel. Enjoy the ride and to hell with mpg. IMO
Used Octane 94 for ever, now I use 91 >>>> Same, but less carbon build-up and save a couple of cents!

Ditto! Who buys an RX8 for the mpg???

unpossible!!! what rpm you shift at???

probably like 2,000 for everything >.> and stay under 3k all the time =) LOL maybe that would work...or he just uses neutral A LOT, but even that might not work

driving like a granny might though. Hybrid Driving Style FTW

Almost no people. But i have heard of many people who had to return/sell their RX-8 cause they couldn't afford the gas for their car.

A tragedy, but still, it occurs.

Yesterday had to fill-up @ fuel light on 320 Km, was thrashing it the last few days, shifting range 4500 to 8500, it's the nice weather!
Best I've every gotten was 410 Km straight highway@ 125-130
Just STOP THINKING ABOUT IT

lol that sounds like what i get :D at least now i know there's no major problem with my car :lol:

Same here

Around 300 in the winter.. 350 in the summer.. mix of city/hwy driving.. but my driving is "spirited".

Then again, I didn't buy my 8 for mpg. If mpg was on my mind, I would stick with toyota or honda.

I get between 180miles - 200miles per tank all the time. No difference in seasons and very very little difference if I drive like a granny or drive it like I stole it. Guess which way I drive it hehe. I have gotten 220 miles once and I dont know why. It was right after an oil change and I added Gumout to my gas tank after not premixing for 2 fillups. I premix with about 5oz mmo. At next fillup it went back to normal.

I get about 380kms before the gas light comes on...

Amazing revelation
 

I am getting the same if not better mileage driving around in city traffic between 4000 - 5000 rpm than in 3000 - 4000 rpm...

SO the bonus of this is better power delivery in the former range vs the latter.

Who would have thought, better power at higher rmp's with a rotory engine! :Eyecrazy:

The key point I'm making here is the fact that potentially there is better fuel consumption at a higher RPM where stop and go traffic is concerned.

A report from some phD in Europe said that accelerate 75% to 100% throttle then coast down to normal save more gas than constant rpm....

http://metrompg.com/posts/speed-vs-mpg.htm
http://www.offroaders.com/tech/impro...as-mileage.htm

Extreme

Generally, the recommended way to hypermile is using only the common techniques. However, extreme hypermilers have been known to use some controversial techniques:

* drafting behind trucks
* driving far below the speed limit at times
* taking sharp curves at high speeds (to avoid losing energy to braking)
* coasting with the engine off
* passing red lights or stop signs in areas of low traffic
* over-inflating tires to reduce rolling resistance

THAT ONE I CAN DEFINITELY DO LOL

That's weird, I get better mpg in the winter as long as there no snow!
Always thought it was the cold denser air?

Wont this increase the the wear on the tires?
So, better gas mileage but lower tread life...

On the other hand, I absolutely agree with you... :)

i do all those too!! except running stop signs and red lights...too scared for my life >=( one ticket for me and my insurance will go through the roof!:banghead:

I thought the same. Apparently, I was wrong. Supposedly, the engine has to work harder to get & stay warm. I have stopped looking at the mileage to be honest. Life is more peaceful. :lol:

The RX8 has brakes? Where are they? I havent found them yet :)

Around 4k... but once I go on highway's or pretty cool looking turns, you know what happens from there :lol:












































If you didn't know what I was talking about, it's called going WOT and some nice powerslides. But I do go WOt at 7-8k once or twice every 2 days.

I think it's located on the passenger side floorboard. Well that's where my passengers try to use it anyways. lol

Nope, it's on the center console....slide:)

OK but back on topic...I get 320 km before the light comes on an I upshift at 5500 downshift whenever it gets under 4k. Spirited. Wide tires, lowered wit RB catback.

I usually got about 330km b4 the light goes up in winter.

In Summer...probably a bit more...not sure yet!

LMAO!! you mean they actually have enough time to reach for the brake before they're thrown against the door/centre console while freaking out? :lol:

i found driving in higher rpms i got better mileage as well. i easily get 450 before the light comes on so anywhere from 11-12l/100km i love living in the middle of no where .

I just got 12.7 L/100KM on Shell V-Power!! which is like 50L running 395km or so, best run i've done so far and it was half city and half highway, occasionally spirited driving but then again i don't rev high and keep it up a lot, usually am under 6k unless i'm redlining just to clear out the carbon residue.

THREAD REVIVAL BATMAN!!!!

Just wanna report the most recent tank.... 12.49 MPG or 18.17 L / 100km...

This is with cruising at one hundred and thirty kilometers per hour plus, and like minimum 10 - 15 redlines per day...

also hit speeds that I cannot mention here several times for short bursts..... (i.e. 4th gear redlines)

So considering all that has been said, it's pretty good fuel economy!

got 256.4 km for 46.6L of fuel.

Oh yeah today was -16 outside! Fun fun!


What is everybody getting so far this season?

Got 300-330KM for 50L with rich A/F and a leaking on the turbo inlet.