It would be 17.862 gallons. Assuming that each gas station offers the same price for gas, you can divide each total by 2.75 (the cost) giving you the gallons for each one (round to the nearest Thousandth Ex. 7.3337--->7.334), you can then add them together to get the total
G=the total gallons of gas bought
Equation: (12.073/2.75)+(12.695/2.75)+(11.913/2.75)+(12.442/2.75)=G
(4.390)+(4.616)+(4.332)+(4.524)=G
17.862 gallons=G
<span>We could not give her those glib assurances that naive souls make so easily to others concerning their after state. …
The narrator is making it clear here that he does not believe in an after life. He says that he cannot assure Mrs. Herd that she was going anywhere in an "after state" because he thinks people who say things like that are being 'glib' and 'naive'. </span>
People aren't allowed to be forced into cruel or embarrassing torture.