Since I started this little gasoline experiment back on May 3, gasoline prices have dropped 15¢, and I have earned a 30¢ discount on the grocery store gasoline. This discount has to be used before May 31.
Recalculating my original calculations: If the Shell gas is $3.82 per gallon and I get 35 miles per gallon, that comes to 10.91¢ per mile. The generic gas is $3.76 per gallon and I get 32 miles per gallon, that comes to 11.75¢ per mile. I would save 0.84¢ per mile by buying the more expensive gas. I drive about 330 miles per week to work, so I would save $2.77 per week on gas.
Now, calculating the 30¢ discount, my generic gas would be $3.49 per gallon or 10.9¢ per mile. Is this worth polluting my gas tank for?
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