The best replacement for regular unleaded is premium.

The best alternatives to regular unleaded are rated as following:
★★★★★  premium
★★★★  super unleaded
★★★★  premium unleaded
★★  e85
★  e10
★  super
★  premium fuel
★  super unleaded gas
  v power
  premium unleaded fuel

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Google Trends

Scale is based on the average worldwide traffic of regular unleaded in all years. Click on graph for more.
regular unleaded
premium
super unleaded