Quote:
Tye previously said:
I also live in Colrado, and don't have my FJ...yet (this spring). I also run 85 octane in my Jeep Wrangler. I was told by a dealership once that the owner's manuals don't say anything about 85 octane because most states don't have it avaiable (altitude thing I assume). This is a topic I will follow because I was bummed to hear that Toyota recommends premium. Any info is appreciated...especially Colorado or high altitude info.
Thanks, Tye
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Welcome Tye,
I live at 7,200 ft and run 91 since that gives me max HP and TQ and I need all I can get at this altitude. As well, I have averaged 23 mpg since owning the FJ and putting on 15,000 miles so I see no reason to run RUL (85 at high alt). But, the FJ will run just fine on it (85, 87 or 91). The ECM was designed to handle lower octane fuels and no harm will come. I would recommend, running 1/2 dozen tanks on 85 and another 1/2 dozen (in a row) with 91 and see if you notice any differences. If not, just run the 85 octane.
And yes, at high alt (above 4,000') the octane required by engines is lessened by 2 points. So 85 here is = to 87 at sea level. 91 here is = to 93 octane at sea level. That's because the air is less dense and the octane requirement is lower because of the lower compression. It's different however if you are supercharged or turbocharged.
DEWFPO
