100 octane

Now that would make it worth the expense. 91 octane only costs 4% more than 87 here. If I'm getting 17 and I can get 18 that's about 6% better mileage for 4% more cost.

So why doesn't Toyota reccommend 91 octane?

 

Glad you corrected my misstatement. The real question is if the 4-cyl. would benefit much from 91 octane.

 

I think they do on some of their vehicles, for instance their FJ's. Same motor and all be I heard they reccommend 91. Not sure why they don't for the Tacomas.

 

It is "recommended for best performance" on the Tacoma. Otherwise, the timing is retarded (like some of my friends when they drink).

 

As far as the lead thing goes for the motorcycle, i know many stores like advance and autozone sell a lead sub. for older engines like that.

With aviation grade fuel...im not sure about n/a engines (i have only flown two types of planes), but the n/a plane that I flew (a 172) took 100LL octane fuel, and from what i understand it had a 360 cubic inch 4 cylinder that generated 190hp...cant remember what torque was.....and if i remember correctly about the rpms....it maxed at a little over 2000, so I think he is very correct about the aviation fuels....

However, on a turboprop aircraft, this may be a little different as they have much higher rpms (im talking in excess of 30k)...however the compression ratio on at least the only one im familiar with (T-34) is 7:1....so im not really sure how that would affect fuel in terms of octane rating other than that we use a very high octane fuel (commonly we use JETA or JETA1).....I believe that alot of this has strictly to do with altitude though.....as vehicles change alt. very slowly when driving, it is nothing for a plane to lose/gain a few thousand feet in under a min.(depending on the type of plane)....this i think is where the big thing is about the octane rating comes in.



sorry if i kinda ran away with that topic....i just really like to talk about planes

 

oh, whatever

 

Damn! I read that entire 520 page owner's manual and somehow I missed that.

I'm still running on that "free" tank of gas the dealer gives you, so I imagine that's just 87 octane. In a couple hundred miles it'll be on empty & I'll try the 91 octane. That's the best normally available around here.

 

waste of money IMO

 

Nice link!

 

Why else would the timing be retarded? Obviously, if the ECU retards the timing, which it will with 87, you will have less power. And it was in earlier model year manuals. Nothing changed with the engine soooooo.............

Here's a chart that backs up my statements:

 

(PSSSTT! It's a joke)

 

This is my first Tacoma, so I'm totally unfamiliar with what Toyota has done in the past.

I am familliar with the concept of timing optimized by the ECU, so I'm not surprised that Toyota would do this.

I'll figure out a bit more about this truck once I get an actual manual for it. the '06 manual (newest I've found online so far) is going to take another decade to download.

 

You mean it has O2 sensors both ahead and after the Cat?

 

Damn Funny