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DO NOT just put in low octane fuel.
Yes the 460's ECU will pull timing when it sees octane knock but it only has so much ability before it throws a CEL because it knows something is wrong.
You can use as low as 91 (Premium here in CA) and you'll be fine.
Unless one goes to one of the few gas stations that cell 105 octane racing fuel (there's Unioin 76 station down here in Aliso Viejo that sells 105), in California, the highest common fuel is 91 octane. Not sure if any other states sell any higher octane throughout their state as "premium" fuel. Are there other states that there "premium" is higher than 91 octane?DO NOT just put in low octane fuel.
Yes the 460's ECU will pull timing when it sees octane knock but it only has so much ability before it throws a CEL because it knows something is wrong.
You can use as low as 91 (Premium here in CA) and you'll be fine.
I suggest you log ignition advance and fuel trims to see the truth behind the 87 vs 91 or you could put it on an actual dyno since we all know that a butt dyno is useless.
You're down about 10bhp and roughly 15 ft/lbs.
It will take at least a tank or two for the ignition multiplier to reset and to get the proper ignition advance for the better fuel.
I didn't say it wouldn't work, there's a chance you'll set a CEL, you lose power and torque, and adversely effect emissions efficiency.
Yes, There is 93 octane available in multiple states.
Agreed, but it's a nit in terms of 350 extra pounds of steel bumpers, winch, sliders, skids, wider, taller tires, and worse aerodynamics with a lift. Plus, some of us drove 2F powered Land Cruisers, which weighed about the same as the GX, and rolled off the assembly line with a whopping 135 HP on a good day. If 9 extra HP is make or break, you're in the wrong type of car...Bear in mind while other markets allow for lower octane… they also have lower output… IIRC most foreign 460 brochures list 292HP versus 301.
Ah-ha!! My point exactly!I've been running 87 in my GX for around a year now (started was it crossed the $2/gallon threshold) and really don't tell much of a difference in power. However, I used to be able to get 19-20 mpg pretty easily, but now seem stuck in the 17-18 mpg range.