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What does 'straight gas', 'winter RFG', 'summer RFG', etc mean in the mileage logs?

Hi Satchel:

___There are different formulations of gasoline in different parts of the country at different times of the year. Winter RFG w/ E-10 for example has the lowest BTU/gallon content and is the worst fuel for FE vs. straight non-RFG w/ no ethanol gasoline. I believe you can still find the latter in some of the Gulf Coast states as well as OK possibly. Southern States usually do not see Winter RFG but continue with a summer RFG with a different Vapor Pressure to reduce evaporation. Summer “fuel” is better non-E10 is even better than that.

___Good Luck

___Wayne