Gasoline grade BTUs per gallon?

Anyone know BTUs/gallon for regular, midgrade, and hi test? Is there a
rule of thumb or an algorithm? Can it be computed from octane number?
My real question is do they adjust the blend to keep the BTUs/$ the
same as the price goes up? My $/mile actually goes down when I run
midgrade.. mileage goes up enough to overcome the increased cost... I'd
like to see a chart or graph... Anyone have a link?

.

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