Hey, the whole gas mileage thing is all relative. I hear a healthy turbo II will get about 17 mpg with "normal" driving. I figure an N/A would get around 23. My other "just for fun" vehicle is an '87 Chevy C30 duallie pickup with a 350 and it gets 10 mpg on a good day, which is about the same as my wife's '78 L-82 Vette. For a high-performance machine, the RX-7 seems pretty thrifty. As soon as I get my car legal, I'll let y'all know what kind of mileage it's getting.



p.s.: Don't overlook dragging brake calipers when looking for a reason for lousy gas mileage. ???

hey...I just realized today that my brother made a mistake when he read the trip counter, he has mistaken a 3 for a 8 (it was at night), it means I only got 20.5 mpg on that long road trip instead of 27 mpg. It also means the fact I removed the cat hasn't changed anything on fuel economy, but changed alot on power. In fact I even think that wiring the 5th and 6th ports open had a negative effect on fuel economy since I used to get 23 mpg on long road trip.

Your right there, My wifes 87 NA gets around 21 mpg

while on the other hand my 74 ford ranchero with a 460

gets 8 mpg thats on the freeway going down hill with

the wind to my back. (but once i catch up with her i leave

her way way way behind lol)

hmm, maybe I should check into that, where is the O2 sensor located? and how can I test it? and hopefully, if that is the problem, how much does it cost to replace?

my TII got pretty good gas mileage on the highway when i wasn't going for landspeed records https://www.nopistons.com/forums/pub...IR#>/devil.gif

hmm, maybe I should check into that, where is the O2 sensor located? and how can I test it? and hopefully, if that is the problem, how much does it cost to replace?[/quote]

well, if you are standing in front of the car and look down the left side of the engine to the exhaust manifold you will see wires going into the O2 sensor. It goes into the pipe before the cat.



As for price, new mazda one is kinda expensive and Bosch sells a one wire universal that will work for like $30.



I am sure there is a test for it but if you haven't replaced it, just replace it. They go bad and it is good to change out. Especially if you haven't been getting the kinda mileage you used to. Its one of those things that isn't worth testing. If it has been in there for a long time or you haven't changed it since you have owned the car, swap it out.



Oh yeah, buy yourself a O2 socket and a long extension to make it easier.

Mine was $34.95.