Taxi rates could climb by more than $1 per mile if a proposal before the city’s taxi commission is adopted Thursday.

The D.C. Taxicab Commission is slated to vote that day on the fare increase to $2.75 from $1.50, following a strong backing from Mayor Vincent Gray during campaign season last year, according to a report by the Washington Examiner. Cab drivers drove Gray supporters to the polls free of charge on election day.

“He was supposed to get us the fair [sic] increase,” Carolyn Robinson, a cab driver who helped Gray’s campaign, told the Examiner. The mayor pledged during the campaign to reexamine taxi fare rates, which have remained steady since 2006, she said.

Gray has created an eight-point plan that includes fare increases and the installation of credit card machines in vehicles as part of upgrades the city’s 7,300-cab fleet, according to the article. He also nominated the commission’s chairman Ron Linton this summer.

Pedro Ribeiro, a Gray spokesman, said the mayor is reviewing fares to ensure they are balanced for customers and drivers and match up with other cities’ rates, according to the Examiner.