Quote:
Originally Posted by Synister
Yes, but its not instantaneous. I remember reading a very well written article about running higher octane fuel is various engines. Toyota's ECU's apparently incrementally adjust timing to just when knocking occurs and then back off a little for maximum efficiency. In this case, consistently (I mean like 5 or 6 tanks in a row) running premium fuel will allow this gradual timing advance to occur which is where I believe the small additional horsepower/torque numbers come from.
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I've been using Shell. 87 contains up to 10 percent ethanol. 89 contains up to 5 percent ethanol. 91 "V-Power" contains no ethanol.
The fuel consumtion display showed a reduction of 1 to 1.5L/100 km when I switched from 87 to the 91 maybe because of the no ethanol but also maybe because the engine gets more spark advance more often (= more power/efficiency).
But I believe, despite how sophisticated the spark advance management and combustion chambers/intake ports may be, a 10:1 engine will very much appreciate the higher octane like a chimp enjoys ripe bannanas.
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'94 Pickup Xtra-Cab V6/Auto 4WD
'09 4Runner SR5 V6 4WD
'21 Tacoma TRD Off-Road
