The Hybrid Highlander manual states that it requires at least 87 Octane gas, but higher octane is preferred.
I've been running 87 Octane only, since I'm a cheapskate.
I've always understood that if you're not hearing engine-knock, then there's no reason to buy premium gas... But I think this gets more complicated with computer controlled variable timing engines. Does this old rule still apply?
And more specifically, is there really any reason to run high octane gas in the Hybrid Highlander? Will it increase my mileage? Will it increase my mileage enough to pay for the more expensive gas?
Thanks,
_Am
