your right another lame MPG thread.

Oh that reminds me, I think I'll go over to the G8 forum and start a MPG thread and complain about bad MPG.

 

all you can do is just drive like an old grandma and save your gas don't drive like a maniac. I live in chicago and i stop and go constantly i get about 210-240 miles on a full tank.

And yeah, if you cannot afford the 5extra bucks at the pump then the rx8 isent worth it. I look at it like this, this car is so damn amazing and your worth the extra 5bucks.

 

Not that I am a rich guy, but saving $456 a year doesn't excite me.

I would rather pay an extra $1.25 a day to get the optimal performance from a car, if indeed the 93 gives better performance and/or it is better for the car than 89.



Ah, so you believe you get better MPG with 89 than you do with 93?

I'm not familiar with that "debate"

 

i have no science to back it up, nor do i recommend it.. but 89 has gave me some good mpg o.O...

 

This is not unusual, rotary engines have always run better on lower octane because of the long thin combustion chamber. The quicker burning of the lower octane is better suite for the Rotary. Race Rotary have run on octanes as low as 80 octane. So by the Rotary's nature it will run better, aka more power, with lower octane.

Granted the knock sensor could retard the time to the point that it would effect power out put but at the same time the lower octane could just as well over come this lose and provide more power. This is why the manual says may have decreased power.

 

Next fill up I'm trying 89 even though I live in florida and it is now summer time.

Do though have a different question though not really related to octane.
Since we should rev our engines to avoid/remove carbon build up (which higher octane gas has no effect on if I follow this thread correctly) then how does one know just how long one needs to drive at the higher revs to 'meet' the goal of reducing/removing carbon build up?

Having an automatic, in auto mode, drops the revs below 2k it seems many times. I took her for a ride on the interstate for an one hour down somewhere then one hour back today and let it go in 3rd gear around 80mph and believe she was turning around 6,250 or 6,500 rpm. Did that for a few miles on curse control but I do wonder what is enough?

I know...most will say always keep her at 5 or 6k rpm but more times then that just won't be happening.

Bottomline -
just how many miles should one drive the rx8 at, say 6,500 rpm on each tank of gas to keep carbon build up at bay? Taking into account, and I have not a clue on this...that running at lower rpm will result is better mpg then running at the higher rpm ranges and since gas is costing more I would like to get better mpg then not provided I don't raise my rx8 to be a carbon build up baby.

And try, as best you can, to turn the flames down low if you would in your replies

19.37 mpg on prior tank (40% highway with a short 100mph run...less then two miles I would say)...just to see her do it
17.61 mpg last tank, mostly city driving

thanks

 

^^^^

Rev it often. There's no exact number or ratio to go off of. Just make it a habit to rev it up a little in your driving routine. I make it a point to wrap out 2nd gear while merging onto the highway (as long as safety permits).

 

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