CREATE TABLE table_2175858_1 (miles__km_ VARCHAR, average_speed__mph_ VARCHAR)

How many miles were driven with the average speed at 116.81?
SELECT miles__km_ FROM table_2175858_1 WHERE average_speed__mph_ = "116.81"
SELECT "miles__km_" FROM "table_2175858_1" WHERE "116.81" = "average_speed__mph_"