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Originally Posted by Ecky
Does the LS400 call for high octane fuel? Be aware that higher octane gas has marginally less energy per gallon,
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Really? Learned something new today!
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all else being equal, your fuel economy will be slightly worse. Many newer vehicles can advance the timing a bit and (partly) offset the extra fuel costs with higher octane gas, but it's almost never cost effective.
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The timing advance wouldn't offset the lower BTUs to at least cancel out the efficiency difference? (Disregarding price issues.)