The average savings for public transit riders is $9,811, annually, and more than $818 per month, according to the American Public Transportation Association's (APTA) October Transit Savings Report.

The savings are based on the cost of commuting by public transportation compared to the cost of owning and driving a vehicle, which includes the Oct. 23, 2014 average national gas price — $3.08 per gallon- reported by AAA — and the national unreserved monthly parking rate numbers.

APTA releases the monthly Transit Savings Report to examine how an individual in a two-person household can save money by taking public transportation and living with one less car.

The national average for a monthly unreserved parking space in a downtown business district is $166.26, according to the 2012 Colliers International Parking Rate Study, which is the most recent report available. Over the course of a year, parking costs for a vehicle can amount to an average of $1,995.