Stop in for a cup of coffee

Ddaddy said
A couple more old Sunoco ads, each nearly 50 years apart...

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That second is an interesting ad.
260 is, or also is, a racing fuel.
Lets see what's currently offered.
Yup 260GT and GT plus have eth (oxygenated) and GTX is non-oxygenated.
https://www.sunocoracefuels.com/fuels/compare-fuels?fid=26