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Strictly speaking of premium grade unleaded (91-93 octane). My high compression '65 273 V8 4BBL ran noticeably better on ExXon of the mid-90s compared to Shell or Texaco, but particularly better than Shell. I can't feel the difference between them when driving my Z tho. Shell is/was Dutch owned. Chevron runs well for me too. In Austin it seems all filling stations are being pushed out of the market by ExXon TigerMarkets. They have KrispyKreme doughnuts, Antones po-boys, clean restrooms, fresh coffee and good music.
Stephen
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