Running 91 octane will increase your Mileage. In my Tundra I see about a 1-2mpg increase with premium over regular unleaded. I saw about a 2-3mpg increase in my 01 Tacoma that I put a 200K on also.

Customer cam in with an 05 Tacoma today, just an oil change...but while I was filling out the service reminder in the service book that he supplied, I also took a glance in the owners manual.

Sure enough, it says *Recomended fuel, 91 octane*
His is an 05 4.0 6 speed TRD Package

I noticed a solid 2 MPG increase in My ol' 92 Runner 3.0, 5 Speed whilst running 91 octane.

Also, seemed to have a *bit* more power, probably helped with the advanced timing.

With higher octane levels, it's a smoother,slower burn. Not so much as a *POP* with lower octane.

Havn't tried 91 with My Honda yet, $3.89 a gallon just isn't very appeling...but, my 33 MPG freeway sure is! <img src="/forums/images/graemlins/smile.gif" alt="" />

Maybe I'll try 91 on a tank, just for kicks...

-Dano-
<img src="/forums/images/graemlins/rolleyes.gif" alt="" />

I run plain old 87 octane. Nothing different since it was new.

I've owned several Toyotas now, most since they were new, off the lot and typically I didn't see real increases in performance or efficiency until around 25K.

Again, I'm not complaining about the fuel economy, just trying to figure out why.

Something I posted elsewhere:



I have a couple of calls in at Toyota. Dunno if they'll call me back or not but it can't hurt to try the source.

Mike