Google maps, by the way, has it at 2 miles. 4 miles round trip.
(Twin Trees Lane, Sanford, FL to 101 South Oregon Avenue, Sanford, FL 32771 - the nearest 7-Eleven I could find).
7-Eleven may have removed it from their website. Google has a 7-Eleven here: 1125 Rinehart Road, Sanford, FL 32771 (7-Eleven). This is almost exactly a mile.