Normal rx7 type hard driving : 15mpg

Easy 70mph freeway driving: 27mpg

This was with my 87 base FC before I had to put it down (temporarily)

 

crappy... thats all I know. I don't even keep track so I'm not sure exactly what mpg she gets.

 

you got to be kidding right 27mpg on freeway? I got about 15 and 17 before I change that tem O2 now I have about 18/20 on my 90 TII.

 

No I am not kidding. It got 27mpg coming home from Portland right after I bought it. This included some test drive city miles, too. A healthy NA that is driven normally and not hard can do 27mpg freeway. Some streetported and modded NA's even do this.

Crappy MPG with the turbos is because turboed engines need extra fuel as a coolant inside the combustion chambers. This is why most tuners set aftermarket standalone ECU's to 13:1ish air/fuel ratio on turboed rotaries. Stoichiometric (perfect chemical combustion) is 14.7:1 and best MPG is about 15:1, with best power about 13.5:1. Some really modded FD's run in the 11:1 range under heavy boost. How does 5-8mpg sound?

 

19mpg or about 320 miles to the tank



-Shawn

 

10mpg thrashing the car around town, I've squeaked 13 out of it, but it's really hard to not step on it. Before the turbo swap I got 18mpg on the freeway <sob...> Car's a '90 TII with a 60-1 turbo / 3" exhaust / Haltech E6K running things.

-Manolis

 

20mpg in the city and 25mpg on the hwy.

 

I get around 15 mpg in my realitively stock NA.
Which translates into about 200 Miles. I don't know about High Way miles. Lates Matt22

 

fuuken heck... i got 160 miles for a fill up.. it cost me 40£ as i live in England.. for those in america... where i am from it is about 65$ for a fill up... hmmm makes me wounder if this was a economical car??? lol my wife thinks it is.. but she hasnt seen my bank account yet!!!

 

how are u guys figuring out ya mpg??

i live in Canada so how do i figure it out?

 

Fill up on gas, reset your trip meter, go drive until you are at about at a 1/4 of a tank. Then fill up again. Take how many liters it took to fill the second time and divide it by your trip milage. That will give you km/liter. Times the km by 4 to get km/gallon. Then divide km by 1.6 I think.

 

A more reliable way would be to write down your odometer mileage every time you fill up and how much gas you've put into your car. That way if you forget to set the trip meter or something, you can still calculate MPG.

Then to figure out the MPG, you wield the same math skills that Mazda engineers use to calculate the volume of the combustion chamber of a rotary engine.

 

I used a convert program on my calculator

 

I am getting about 10mpg on the highway and 9 in town... only mod is full exhaust.... my idle is kinda freaky though... do you think that TPS can cause REALLY bad gas mileage? I think my BAC valve needs cleaning too.

 

18/24, I've had worse.

 

without the O2 sensor hooked up at ALL. cause it sucks... oh.. usually around 20 mpg highway.. average around 18 total (city/highway mix).

 

about 16-17mpg around stupid LA traffic crap, about 26 pure freeway driving.

 

Something is not right. Have you replaced your O2 sensor recently (if ever?). How about your spark plugs (in fact, are they even hooked up?). Have you replaced your spark plug wires? Check a few things, as something is wrong.

 

87 GXL - about 300/mpg highway
87 TII (R.I.P.) - about 200/mpg highway

 

I got 245 miles out of one tank, and this was mostly highway. The way i figured it out was i devide the miles (245) by the amount put into the tank which is 13 gallons and i get like 18mpg

 

new spark plugs, new o2 sensor, not new wires.... My plugs were extremely fouled though when I pulled them out. My dad thinks it is the coils.... I seriously doubt that as I have heard a lot of good things about the stock mazda coils. I think it might be the wires, except that I tested them with a meter and they seemed to get pretty good resistance. the car runs smooth @ low idle (800) but hiccups every so often @ high idle (1500) and sometimes the idle sticks @ 2500, but is fixed with a little blip of the throttle... is there any way to clean the BAC without taking off the water lines? I really hate getting antifreeze everywhere. It also seems like my car takes forever to warm up. I don't think that is the problem, though, because I can take long trips on the highway and not get good gas mileage there either. another option is that I have sticky injector(s) except that I had those cleaned, too before I put them back into the car. (approx. 2k mi ago) I kept the injectors in a ziploc bag until I put them in the car.

 

goddamn forgot my sig

 

i get about 11.6 miles per gallon. i drive fast as hell