Originally Posted by praxis

i was under the impression that since it was the "after the cat 02 sensor" it had no bearing on fuel mixture or performance. the sensor i had changed was the one farthest down the line. ie,, after the cat, (the one under the drivers seat and inline the exhause before/near the resonator i think) would that sensor have any effect on exhaust odor? i thought that one was only emissions related. i was told by the lexus dealer that the sensor in question would not affect gas mileage or anything but would only prevent emission inspecion passing for my state/locality. the only code i had was p0136.

it does make sense that different gas blends could cause different odors.


there is ONE thing i can add to the octane discussion. my rx has a lot more "kick" with the higher octane gas. thats all i have to say about that.. lol

Originally Posted by praxis

i was under the impression that since it was the "after the cat 02 sensor" it had no bearing on fuel mixture or performance. the sensor i had changed was the one farthest down the line. ie,, after the cat, (the one under the drivers seat and inline the exhause before/near the resonator i think) would that sensor have any effect on exhaust odor? i thought that one was only emissions related. i was told by the lexus dealer that the sensor in question would not affect gas mileage or anything but would only prevent emission inspecion passing for my state/locality. the only code i had was p0136.

it does make sense that different gas blends could cause different odors.


there is ONE thing i can add to the octane discussion. my rx has a lot more "kick" with the higher octane gas. thats all i have to say about that.. lol

Originally Posted by lexus114

Okay,I tried another experiment last week.I noticed last summer when I put 87 octane in the RX,that when it adjusted itself the millage jumped from .5 to 1.5 mpg. (and this is not only going by the computer)also the power is almost just as good. So I decided to try this again last week,sure enough the millage jumped from 19.6 to 20.5 and has very good power/throttle response.I can`t figure this out for the life of me how this is possible,especially during warm weather.Now here is the catch!! as soon as the winter blend of fuel comes out,it`s all over....millage drops big time,power goes along with it.Needles to say,I`m glad I can at least save money during the summer month`s.

Originally Posted by Lexmex

Also consider any change in altitude.

Originally Posted by lexus114

Lex,dont you find this strange though?? Same altitude and everything,nothing changed.