TYork

Check to make sure that the fuel pump outlet is not cracked and leaking gasoline (it was on my 2004). Also check for vacuum leaks; the three black plastic 1/4" fittings on the intake bellows is a good place to start.

sjschutz

Yeah, sorry OP and club members. I saw the thread title and instead of reading through his post I just assumed it was another "why my RX-8 no get good mpgs" type of thing and quick replied. Newbie mistake. 7 miles per gallon is a problem, even for an '8.

Red_lineRX-8

Not sure if this is a dumb question but does that help these out alot and is it safe to seafoam the rotory?
I just got an RX-8 and it feels like it should pull alot harder... feels like it wants to go faster but it like its hold its self back. i plan to check the plugs maybe give it a tune up tomorrow and see how she performs then

Bladecutter

Everyone has a slightly different opinion on what degree "Seafoam" or any other detergent actually provides in cleaning benefits. Some say little to none, others say quite a bit.

Anyway, sounds like you recently bought your car.
Chances are you should go through all the threads aimed at new owners of used cars, and go through the list of items to help bring your car up to spec in regards to knowing that you have a properly working car.

BC.

dynamho

OP, didn't read the whole thread yet, but it looks like your there's something wrong with your car. I don't know how you drive it but 3 kpl is very low, even for this car.

Also check your brakes to see that they haven't seized up.

Don't forget to check for gold bullions hidden in the trunk, and always fill up with SUPER UNIQUE.

05rex30

Red...lots of people here have an opinion bout it and I had some hesitation and used it and the hesitation went away..I also got a little better mpg for that fill up I usually get a consistent 18.7 but ended up with 19.5

Brettus

iTrader: (2)

Funny - the OP left the building days ago yet everyone is still trying show him the way ....

sambo

thanks everyone ... nothing is perfect when you are buying a recondition car , we need to make it perfect as we want ... thanks to all who suggests me ... I will definitely try to make my car perfect again .

filmdoctor

I paid $4,000 for my friends 2004 MAZDA RX-8 and have put an additional $1,500 into it including alot of VACUUM and ECG sensores...I am getting approximately 10 mpg with the
6 speed manual...the dealer wants $990 for a tuneup, and 3 solenoid parts ...air filter new...does anyone online have SUGGESTIONS

NotAPreppie

Coils/plugs/wires $310 + shipping (bottom of page)

Air Filter $23.50 + shipping

Solenoids $22.80 each + shpiping
(assuming they are referring to the 3 vacuum solenoids on the back of the UIM. I've used these on my '8 and they work perfectly.)

Total: ~$400 + shipping.

All of these are relatively easy items to do that don't require anything more special than a basic mechanic's toolkit from Horrible Freight.

Total with tools: $531.90 + shipping

While you're at it, you should get a and a $10 phone app so you can pull data from the car like fuel trims, MAF rate, AFR, coolant temp. All this stuff makes troubleshooting easier.

Loki

iTrader: (1)

What you need are probably coils and spark plugs. They're easy to change yourself and available at NAPA or similar. . Its extremely rare to need to replace all 3 solenoids unless there is a check engine light for a specific one.

delhi

For starters you bought an 04. Secondly there's no good rx8 at that low price. The ones I see here under $5k are all having engine issues. Anyway atleast it runs. Money saved put into the above suggestions and hope that's that.

About​​About mileage rotaries are terrible in stop and go traffic. Also winter gas formula hurt mileage too. I see about 10-15% drop during winter time. But that could be a combination of more accessories running and lumpy winter tires.