kpex76

hmm..I've been getting about 250 miles with 13.5gal of gas.
that's about 18.5-19miles per gallon.

It would be nice to get about 22-24miles per gallon like my evo did
but I am not complaining.

BTW, I have a pretty heavy right foot so I am not granny driving my car.

I just bought the car about 2 weeks ago with 10k miles on it.
It's a 6spd GT.
I just went to mazda to have some TSB's and was told that it had a new motor
put in @ 6500 mark.

Im really hoping I don't have any future probs with this car.

BigRed

thats not good if u didnt know that it had a motor replacement...

kpex76

well...when I ran carfax before purchasing the car nothing came up.

Why is it bad that the car had a new motor put on?
The car drives absolutely fine though.

zeblien

At first, I reported to this thread (last year) I was getting 18mpg @ 70% hwy (aggressive)


Now, after 15k miles, I am getting around 20mpg @20% hwy miles (moved) (aggressive).

djwalik

20MPG
But a month ago I was getting only 16. And that's because this car was staying in garage for a couple of month.

zeblien

Alright, so after a highway trip, here is what I was getting:

70mph avg (hilly 4k-7k elevation) 24.5 mpg (full tank) 90% highway
90mph avg (same as above) 23 mpg (3/4 tank) 100% higway

RMZ290

Kind of surprised everyone complains about gas mileage on these cars. I drive mostly back roads with some city and in the last two weeks have gotten between 21.5 to 24.5 mpg. Just driving normally.

psonoda

I have owned the car about 2 1/2 months. I average between 13.8 to 14.3 MPG. I do 95% off HWY driving but the higher numbers did have 30% HWY miles. I do have a big right foot, but I am having trouble beliving the RX8 getting WORSE MPG than my 318HP/380lb.ft. 4000lb Audi A6. I drive both the same way. I get 16-17 in city and 24 on the HWY in the Audi. Granted the RX8 is much more fun to drive but the A6 is much faster. Does anyone else get this bad of milage?

chavy85

there is a recall on the plugs and some other things you shoudl get done. then you MPG should go up. mine did.
went from 18-19 to 23-25 best ever was 27.
new plugs and recalled cat was my problem.

HR.

Myardor

iTrader: (7)

Filled up went to local grocery store, 3 miles
Drove 234.7 miles. Mostly doing 57-59mph. North 45 to Madisonville.
Slowest 49mp, fastest 64
One bumper to bumper stretch- burning van on freeway.
Hit 81mph but only briefly.
So what's my average mpg? 25.81mpg?
9.093 gal reg unleaded @$2.529/ga = 23 bucks !l

Oh yea, everyone passed me, including a one legged duck!

Dealer replaced 2 leading plugs / emissions recall 4206F yesterday

Rx8urZ

dAMN the most i can get out of a full tank of 91 is like 250 miles and thats with the low fuel light on for quite a while. my car has 54k on it and its a manual i might change the spark plugs this weekend which i think should help out a little

psonoda

I made a appointment with a different dealer for service. I told them the crappy gas milage I had and they told me that was TYPICAL!? So then I told them about my high rpm power loss. They are going to look at it as well as a couple of other things. I will ask them about the following:

Coils
Plugs
Cat

All the othe PCM updates have been done. I really don't think my MPG should never get above 14.3.

Is their anything else I should have them check?
Thanks everyone

Myardor

iTrader: (7)

[QUOTE=psonoda;2113316]>>>>>>>>>> I really don't think my MPG should never get above 14.3.

Pardon my English but you say>>> should never get above 14.3
Do you mean.... below?

psonoda

What bad english. I meant to say my MPG has never been above 14.3. It typically ranges between 13.8 to 14.3. Very Bad!

I took it to the dealer yesterday. They told me the MPG might improve if I changed the plugs. A dealer cost of $240. Ouch.

Interesingly enough the problem I reported to Jake Sweeney Mazda about the cluch engaging funny came back with "No problem found" However, Kings Mazda was able to find and replace two broken motor mounts. The car is feeling much better as a result.

I bought plugs from Napa for just under $100 for the set. (Dealer wants $160) Plan to replace them this weekend. Will let everyone know if there is a milage change.

Myardor

iTrader: (7)

ok understand. Yikes, that's too low. Guess spark plugs change will help it. How long has your 8 had its plugs?miles wise

RX8BANGLA

I drive my 05, RX-8(SE3P Auto 4 Speed) in Dhaka, Bangladesh, where temperature is around 35 degree celcius and in city driving I get around 4 kilometer per litre with 92 Octane.

Can someone tell me why do I get a horrible fuel consumption?

Thanks.

Jasonawojo

iTrader: (2)

I was getting a consistant 13-14mpg on my original engine. Seems to be close to the same with my reman one so far, but I figure I ought to wait for it to be broken in before I worry.
I do 70 city / 30 highway and drive moderately.

AK83

New 07 RX-8 MT here, the past 3 months I average 18mpg if I drive very very conservately, 16mpg if I romp throughout full throttle 7000-9000rpm during the trips.

psonoda

I just finished chaning my spark plugs. I thought is was going to be a real pain until I realized there was easy access through the driver's wheel well.

By jacking up the car and removing the front wheel, I had almost a straight shot to the plugs.










As you can see the plugs were somewhat dirty. If you change your spark plugs, I recommend you have lots of extensions. It made the job much easier.

Another thing I found was the the forward leading spark plug boot was loose while the rear trailing plug boot was nearly off. I had to pinch the boots to get good contact between the boots and the spark plugs. I will let you know about the milage with the next tank. Going to fill the gas up and test her out.

heyarnold69

iTrader: (1)

was that a minitab spreadsheet?


also use an 18" extension and a joint and its even easier!

psonoda

My first tank after the spark plug change has improved my milage slightly. This tank I got 15.1 MPG. A small but welcome improvement.

I was wondering if anyone who has added an upgraded air box or air filter has noticed a MPG improvement? I was thinking about changing to a K&N filter while modding the factory airbox (Removing the internal baffles) and reducting the air out the front of the bumper for less restricted cooler air.

Any thoughts?

RX8BANGLA

I have changed my spark plug and changed the stock filter to K&N drop in filter. Now I get 10 MPG with 90% city driving.

chavy85

damn... 10 mpg sucks.
have you checked your cat? the way you check them is drive the car till it's fully warmed up. then let it idle and jack it up. take a temp gun and check the temp on the front and the rear of the cat. the guns are rather cheep kinda like and infer red temp gauge. when checking have some one rev the engine a few times to get a good amount of exhaust flow. if the temp on the front is higher then the back of the cat then it's plugged. and needs to be replaced.
the back of the cat should be a lot hotter then the front. that means its doing it's job.

HR

chavy85

psonoda What is the Gas saving kit? I've never head of it...

HR

RX8BANGLA

I have never done it before. I will check my Cat within a few days and let you know the result. Thanks for the tips.