The fleet office also now tracks employees' driving records -- including citations, at-fault collisions and revoked and suspended licenses -- through the Division of Motor Vehicles.
In annual reports, Chandler claimed his changes have saved taxpayers millions of dollars a year.
Chandler, who serves as treasurer of the National Conference of State Fleet Administrators, also created a 91-page manual on fleet policy and procedures.
Most recently, he served on Gov. Earl Ray Tomblin's Natural Gas Vehicle Task Force, which is evaluating whether it is feasible to transition the vehicle fleet to run on natural gas.
Chandler did not respond to a request for comment on his resignation. His son answered the phone at Chandler's house Friday and suggested that a reporter send questions via email. Chandler did not answer the email.
The Fleet Management Office has four employees and an annual budget of about $7 million.
Chandler previously managed Oklahoma's state government vehicle fleet.
Reach Eric Eyre at erice...@wvgazette.com or 304-348-4869.