ok i know its a rotary engine and gas milage aint to pretty on these cars but, with out hard driving am getting about 236 on tank or averaging about 15-14mpg around town. am running rich tho, i seem to back fire alot and when i gun it a huge cloud of black smoke pours out the back. mods. apexi intake and a 3in. turbo back with a high flow cat. it also seems my stock bov is seeping. i dunno if that has anything to do with any of that stuff.but thought i mention it while am complaing here. maybe i just need to get the car dyno tuned? please just offer some suggests, thanks

 

Buy a honda as a daily and you will solve all your problems. Until your not driving an FD around you won't improve your gas miliage. Just being honest.

-josh

 

i have a friend who works for a mazda dealership here in town and he said check the boost sensor, and make sure its pluged in and the hosing is good. how long do those usally last for?(boost sensor)

 

If the boost sensor hose is disconnected or the sensor is malfunctioning, the car will barely run, so i don't think that's it. They are usually pretty bulletproof. If you want to check the hoses, it's the little rectangular box (says boost sensor) mounted on the driver's side firewall next to the brake booster.

 

ok cool. what about the running rich part? how can i fix that?

 

Agreed.

Around town, I usually get ~17 mpg, but that usually includes a significant amount of freeway driving, so I don't think your mileage is that bad.

 

how are your injectors? seems you might have one stuck open...

 

good call , i have about 38,xxx on a new motor would they be out that quick?

 

Wow, yalls gas mileage sucks! I get around 20 city and about 23-24 highway. That was before my PFC. Now I'm gonna see how much it gets with the PFC. I'll tell yall the next time i fill up.

 

I usually get around 14-15mpg city driving. I got a little over 18 last time with mostly interstate, but there were a few boost controller tuning runs on it.

 

if luck is not on your side, maybe...
Your getting to much fuel, that's for sure, I've had a similar problem, and mine turned out to be a leaky injector...Does your ecu give out codes?

 

When was the last time you changed your spark plugs? That makes a VERY big difference.

Dale

 

BS. Are you actually measuring how many gallons you add and divide that into your actual mileage? Or are you just going "I got 200 miles on 1/2 tank according to the fuel gauge"?

 

If that's all city driving that sounds fine to me.

 

33,xxx thats when i replaced the belts to. about when should i change them? every?

 

Every 10 to 15K at the most. Some change them more often. Easiest way is to check them every 3rd oil change and see how they look.

Tim

 

they way it should be measured is have a full tank(i top mine off myself) drive until youre on fumes then divide the mileage by the capacity of the tank. it should say it somewhere in the manual or FSM. i get 16city and 27.6 highway, then again i drive an 85 GSL-SE. only 2 680cc injectors baby yeah!

 

No, that method will not work.

All you have to do is completely fill the tank, drive most of the tank, and take note of how many gallons you add to get it back to full. Divide that into the mileage for that tank. It's that simple and that is the ONLY way to accurately determine fuel mileage.

 

ive been getting 11-12 mpg

 

Why would you not do it this way?? I've never even heard of someone saying, just run it until you think it is almost empty then divide by how many gallons the tank holds, that's just stupid. Maybe fill it up run it out, get a tow, then do that.

I did get 9mpg one time but that was about 1/2 a tank track and 1/2 tank interstate back home. I figured it got probably 4-5 on the track.

 

I don't know why you are complaining, I get around 1.4 mpg just driving around a parking lot

 

Rynberg is saying not to assume that if the tank is empty you used 20 gallons of gas (Mazda says it's a 20 gallon tank). To determine mileage you start with a full tank. You run the car to nearly empty and then you write down how many gallons of gas the pump says you used to fill the tank. Then you know exactly how many gallons of fuel were actually used to travel the distance on your odometer.

Ouch! I get closer to 3.

 

15-17around town and 20-22 freeway. Doesn't sound like your mpg is that far off or maybe i'm right there with you.

 

Yeah, but do you blow 6' flames at dusk and have the police called to investigate the gun battle in the area when you let off the gas !!!

 

Yeah I know what he and you're saying I'm saying the other guy's way is stupid, sorry if it didn't sound like that, lol.