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Non Compos Mentis
Join Date: May 2001
Location: Off the grid- Almost
Posts: 10,634
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As far as performance goes, octane is probably all that matters.
My data point about additives:
The gas gage on my 2001 Chevy truck used to drop to empty and stay there for extended periods, to the point where I would just buy gas every 300 miles on the odometer instead of going by the untrustworthy gage. Drove it this way for months.
I heard (isn't the internet a wonderful thing) that Chevy's sending units were susceptible to getting gunked up, and Chevron's "Techron" would solve it.
Started using Chevron gas. After several tanks, gage started working normally again. Been fine ever since.
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