what to do to make rx-8 more fuel efficient ?
i just purchased a rx-8 2005 model - type E . it has been driven 17259 kilo meters .
but the main problem i am facing , that it is having extreme octane . per liter , it barely runs 3 kilo meters . is it normal for mazda rx-8 ? or , is there any way to make my car more fuel efficient ??? plz help me out . |
So you are getting less than 100km to a tank of fuel?
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"Extreme octane?" Although 93 octane is best for maximum performance, it will run fine all the way down to 87 octane (ECU will auto-retard the timing to protect engine from knock).
18 mpg is typical (7.65 kilometers per liter). The rotary is a known poor fuel efficiency engine. Not much you can do other than the typical "drive like an old lady", but that's not what this vehicle is about. 3 kilo's/liter is exceptionally poor however. Look to replacing your coils and sparkplugs as you may be getting improper ignition. Next would be to have your fuel injectors cleaned. Low compression could also be a culprit (engine/drivetrain is still under warranty for same). |
There is one way...
Sell it to someone who researched the car beforehand and knows that fuel efficiency is not a sports car's selling point. |
There is nothing wrong with a person trying to seek better fuel economy from their car. It is a valid point of discussion.
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1) Make sure you get your tires inflated to the highest-rated for the tires.
2) Low resistance tires also help. 3) Other than that, it's about how you drive the RX-8. You can dog the shit out of her and get low milage, i've gotten higher than 22 when I drive like I was driving a "eco" car. Slow accel, shifting it into 6th as soon as possible, braking lightly. 4) Try to get all the trips in one shot to conserve gas. http://www.tirerack.com/landing/fuel_efficiency.jsp As far as swapping engines... Most do it for power, but i've heard (on this forum) that someone swapped in a corolla(?) into their RX-8 for mpg. I've also seen about reducing the size of the engine to help get the highest MPG. http://www.rotaryeng.net/RX8-TC-eng3.html ...Just make sure you do ride the rx-8 hard. Carbon buildup and all. I usually rev it hard off the line in second gear to the beep. Once a day. |
At 7 mpg, I'd say the problem is more than just tire pressure or driving habits. Huey's last paragraph looks like the right path.
Ken |
^yup.
OP check the usual (plugs/coils, MAF/eccentric shaft position sensors, Cat converter, etc) |
Originally Posted by alnielsen
(Post 4102506)
There is nothing wrong with a person trying to seek better fuel economy from their car. It is a valid point of discussion.
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If you do a lot of highway miles, driving behind someone will increase MPG, do not tailgate but from a safe distance you will still reduce air pressure in front of the car. Mythbusters showed that at a safe distance behind someone you can save about 30% of your fuel, something like that anyway its a while since I saw that episode.
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Originally Posted by sjschutz
(Post 4102492)
There is one way...
Sell it to someone who researched the car beforehand and knows that fuel efficiency is not a sports car's selling point. |
I would also try seafoam
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Originally Posted by sambo
(Post 4102412)
i just purchased a rx-8 2005 model - type E . it has been driven 17259 kilo meters .
but the main problem i am facing , that it is having extreme octane . per liter , it barely runs 3 kilo meters . is it normal for mazda rx-8 ? or , is there any way to make my car more fuel efficient ??? plz help me out . You fill up your tank with say 55litres and get around 160kms before putting in another 55 litres - is this correct ? |
Originally Posted by wrightcomputing
(Post 4102551)
If you do a lot of highway miles, driving behind someone will increase MPG, do not tailgate but from a safe distance you will still reduce air pressure in front of the car. Mythbusters showed that at a safe distance behind someone you can save about 30% of your fuel, something like that anyway its a while since I saw that episode.
NOBODY can save any mpg related to the air from the vehicle in front if you value your life or your paint. Yeah, you can save some riding in the vacuum 20 ft back, but its penny wise and pound foolish ( Think Ben Franklin if you had any education). At the safe distance its not enough to ruin your eyesight for the road. |
I've seen this problem before, and it's usually caused by a bad regulator.
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Originally Posted by RogueTadhg
(Post 4102527)
As far as swapping engines... Most do it for power, but i've heard (on this forum) that someone swapped in a corolla(?) into their RX-8 for mpg.
I've also seen about reducing the size of the engine to help get the highest MPG. http://www.rotaryeng.net/RX8-TC-eng3.html |
Originally Posted by HiFlite999
(Post 4102737)
Interesting. More like an entirely new engine design, unless one wants to swap in a 35 hp rotary with zero performance.
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Originally Posted by wrightcomputing
(Post 4102551)
If you do a lot of highway miles, driving behind someone will increase MPG, do not tailgate but from a safe distance you will still reduce air pressure in front of the car. Mythbusters showed that at a safe distance behind someone you can save about 30% of your fuel, something like that anyway its a while since I saw that episode.
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For the reason of this question, the op did not realize that the rx8 has poor fuel economy. Complaining about it may solve it or not. The only way to save from fuel economy is to get another car with good fuel economy...yeah, that's it.
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MPG seems so hit and miss though.
I used to get a solid 310 miles for the gas light would come now. 2 years later, I am lucky to get 275. Car has had compression checks, new plugs, wires, coils, etc. Has never gotten better. Having the AC on makes it even worse. I am normally getting about 265 miles on a tank before the light comes on. And before anyone asks, I don't drive like a maniac but also don't drive like a grandma and always drive it hard at least twice a day. |
I once had a 1972 ThunderBird with a 460 cu in (7.5 L) V8 ... that car got 6 mpg, was about 18 feet long and weight like 4800 lbs. I would say your 8 has some issues if thats the mpg you're getting.
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Originally Posted by Bigbacon
(Post 4103209)
MPG seems so hit and miss though.
I used to get a solid 310 miles for the gas light would come now. 2 years later, I am lucky to get 275. Car has had compression checks, new plugs, wires, coils, etc. Has never gotten better. Having the AC on makes it even worse. I am normally getting about 265 miles on a tank before the light comes on. And before anyone asks, I don't drive like a maniac but also don't drive like a grandma and always drive it hard at least twice a day. I've seen lots of your discussions, but do you premix, and have BHR coil upgrades? You should get 23-25 on hwy unless you have lots of miles and are losing compression. |
When my car was new, I got 12-13 mpg. 3 engines and 70K miles later, I now get 18-19 mpg. Last fall, I managed to get 300 miles before filling up (about 22 mpg).
Automatics get better mileage than manual models. |
It's interesting how few of you are reading the posts that already exist before posting again.
The OP's car has something wrong with it. 7mpg is worse than full WOT track mileage. Given that, the OP isn't looking for hypermilling techniques, he is looking for help on what is wrong. Some suggestions in that direction have been offered, but plenty of you are giving what can be a 1-3mpg bump, when he needs an 11mpg bump. A healthy RX-8 will get 17-18mpg city, 22+mpg highway. But 'healthy' means completely healthy: healthy coils, wires, plugs, O2 sensors, carbon free engine, good compression, healthy cat (or no cat), good transmission/diff fluid. Let even one of these slide, and your mileage WILL drop, and it will drop fast. If you believe that RX-8s simply can not get this mileage because you have never seen it, then there is only 1 person to blame, and that is YOU. If you don't get this mileage, then there is something wrong with one of the above points. |
Originally Posted by RogueTadhg
(Post 4102527)
I've also seen about reducing the size of the engine to help get the highest MPG.
http://www.rotaryeng.net/RX8-TC-eng3.html ...Just make sure you do ride the rx-8 hard. Carbon buildup and all. I usually rev it hard off the line in second gear to the beep. Once a day. Who am I fooling, pedal to the floor in low gears, just in case I need to accelerate. That's my cruise, and my gas mileage shows it. I did hit 18.3 on my first real highway trip of any distance. Had a lot of fun and isn't that what it's really about?!? Back on topic, definitely something wrong with the car to get only 7 MPG, I haven't even been that low! (14.5 is my lowest). |
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